Updated 4 h ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,762exploited flaws on CISA’s list

34added in the last 30 days

344new WordPress flaws this week

390,080entries in the database

60 results · page 1 of 2

Oct 2, 2026A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GCVE-2026-97876 · Other software · GNU · reported by security@ubuntu.comMedium 6.4
A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled. The vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial command. GRUB does not validate that the base address corresponds to a UART device, rather than being an arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an attacker-controlled address, including resetting the grub_file_verifiers list in a way that disables the subsequent verification of loaded modules.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record gitlab.freedesktop.org openwall.com
Nov 18, 2025A vulnerability in the GRUB2 bootloader has been identified in the normal module.CVE-2025-61664 · Other software · GNU · reported by Red HatMedium 4.9
A vulnerability in the GRUB2 bootloader has been identified in the normal module. This flaw, a memory Use After Free issue, occurs because the normal_exit command is not properly unregistered when its related module is unloaded. An attacker can exploit this condition by invoking the command after the module has been removed, causing the system to improperly access a previously freed memory location. This leads to a system crash or possible impacts in data confidentiality and integrity.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 18, 2025A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk.CVE-2025-61663 · Other software · GNU · reported by Red HatMedium 4.9
A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 18, 2025A Use-After-Free vulnerability has been discovered in GRUB's gettext module.CVE-2025-61662 · Other software · GNU · reported by Red HatHigh 7.8
A Use-After-Free vulnerability has been discovered in GRUB's gettext module. This flaw stems from a programming error where the gettext command remains registered in memory after its module is unloaded. An attacker can exploit this condition by invoking the orphaned command, causing the application to access a memory location that is no longer valid. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Nov 18, 2025A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component.CVE-2025-61661 · Other software · GNU · reported by Red HatMedium 4.8
A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 18, 2025A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader).CVE-2025-54771 · Other software · GNU · reported by Red HatMedium 4.9
A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader). The flaw occurs because the file-closing process incorrectly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 18, 2025A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk.CVE-2025-54770 · Other software · GNU · reported by Red HatMedium 4.9
A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025A flaw was found in grub2.CVE-2025-0686 · Other software · Red Hat · reported by Red HatMedium 6.4
A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025A flaw was found in grub2.CVE-2025-0685 · Other software · Red Hat · reported by Red HatMedium 6.4
A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025A flaw was found in grub2.CVE-2025-0684 · Other software · Red Hat · reported by Red HatMedium 6.4
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025A flaw was found in grub2.CVE-2025-0678 · Other software · Red Hat · reported by Red HatHigh 7.8
A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025A flaw was found in grub2.CVE-2024-45780 · Other software · Red Hat · reported by Red HatMedium 6.7
A flaw was found in grub2. When reading tar files, grub2 allocates an internal buffer for the file name. However, it fails to properly verify the allocation against possible integer overflows. It's possible to cause the allocation length to overflow with a crafted tar file, leading to a heap out-of-bounds write. This flaw eventually allows an attacker to circumvent secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Mar 3, 2025An integer overflow flaw was found in the BFS file system driver in grub2.CVE-2024-45779 · Other software · Red Hat · reported by Red HatMedium 6
An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirect extent map, grub2 fails to validate the number of extent entries to be read. A crafted or corrupted BFS filesystem may cause an integer overflow during the file reading, leading to a heap of bounds read. As a consequence, sensitive data may be leaked, or grub2 will crash.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Feb 19, 2025A flaw was found in grub2.CVE-2025-0677 · Other software · Red Hat · reported by Red HatMedium 6.4
A flaw was found in grub2. When performing a symlink lookup, the grub's UFS module checks the inode's data size to allocate the internal buffer to read the file content, however, it fails to check if the symlink data size has overflown. When this occurs, grub_malloc() may be called with a smaller value than needed. When further reading the data from the disk into the buffer, the grub_ufs_lookup_symlink() function will write past the end of the allocated size. An attack can leverage this by crafting a malicious filesystem, and as a result, it will corrupt data stored in the heap, allowing for arbitrary code execution used to by-pass secure boot mechanisms.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 19, 2025A flaw was found in grub2.CVE-2025-0624 · Other software · Red Hat · reported by Red HatHigh 7.6
A flaw was found in grub2. During the network boot process, when trying to search for the configuration file, grub copies data from a user controlled environment variable into an internal buffer using the grub_strcpy() function. During this step, it fails to consider the environment variable length when allocating the internal buffer, resulting in an out-of-bounds write. If correctly exploited, this issue may result in remote code execution through the same network segment grub is searching for the boot information, which can be used to by-pass secure boot protections.
Product
Red Hat Enterprise Linux 7 Extended Lifecycle Support
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 19, 2025A flaw was found in grub2.CVE-2025-1118 · Other software · Red Hat · reported by Red HatMedium 4.4
A flaw was found in grub2. Grub's dump command is not blocked when grub is in lockdown mode, which allows the user to read any memory information, and an attacker may leverage this in order to extract signatures, salts, and other sensitive information from the memory.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 19, 2025A flaw was found in grub2.CVE-2024-45777 · Other software · Red Hat · reported by Red HatMedium 6.7
A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in grub_gettext_getstr_from_position() may overflow, leading to a Out-of-bound write. This issue can be leveraged by an attacker to overwrite grub2's sensitive heap data, eventually leading to the circumvention of secure boot protections.
Product
Red Hat Enterprise Linux 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 18, 2025A flaw was found in grub2.CVE-2024-45783 · Other software · Red Hat · reported by Red HatMedium 4.4
A flaw was found in grub2. When failing to mount an HFS+ grub, the hfsplus filesystem driver doesn't properly set an ERRNO value. This issue may lead to a NULL pointer access.
Product
Red Hat Enterprise Linux 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 18, 2025A flaw was found in grub2.CVE-2024-45781 · Other software · Red Hat · reported by Red HatMedium 6.7
A flaw was found in grub2. When reading a symbolic link's name from a UFS filesystem, grub2 fails to validate the string length taken as an input. The lack of validation may lead to a heap out-of-bounds write, causing data integrity issues and eventually allowing an attacker to circumvent secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 18, 2025When reading the language .mo file in grub_mofile_open(), grub2 fails to verify an integer overflow when allocating its internal buffer.CVE-2024-45776 · Other software · Red Hat · reported by Red HatMedium 6.7
When reading the language .mo file in grub_mofile_open(), grub2 fails to verify an integer overflow when allocating its internal buffer. A crafted .mo file may lead the buffer size calculation to overflow, leading to out-of-bound reads and writes. This flaw allows an attacker to leak sensitive data or overwrite critical data, possibly circumventing secure boot protections.
Product
Red Hat Enterprise Linux 10
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 18, 2025A flaw was found in grub2 where the grub_extcmd_dispatcher() function calls grub_arg_list_alloc() to allocate memory for the grub's argument list.CVE-2024-45775 · Other software · Red Hat · reported by Red HatMedium 5.2
A flaw was found in grub2 where the grub_extcmd_dispatcher() function calls grub_arg_list_alloc() to allocate memory for the grub's argument list. However, it fails to check in case the memory allocation fails. Once the allocation fails, a NULL point will be processed by the parse_option() function, leading grub to crash or, in some rare scenarios, corrupt the IVT data.
Product
Red Hat Enterprise Linux 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Feb 18, 2025A flaw was found in grub2.CVE-2024-45774 · Other software · Red Hat · reported by Red HatMedium 6.7
A flaw was found in grub2. A specially crafted JPEG file can cause the JPEG parser of grub2 to incorrectly check the bounds of its internal buffers, resulting in an out-of-bounds write. The possibility of overwriting sensitive information to bypass secure boot protections is not discarded.
Product
Red Hat Enterprise Linux 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Dec 29, 2024GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.CVE-2024-56738 · Other software · GNU · reported by MITREMedium 5.3
GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.
Product
GRUB2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record savannah.gnu.org
Dec 29, 2024GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem.CVE-2024-56737 · Other software · GNU · reported by MITREHigh 8.8
GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem.
Product
GRUB2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record savannah.gnu.org
Nov 13, 2024grub2 allowed attackers with access to the grub shell to access files on the encrypted disks.CVE-2024-49504 · Other software · SUSE · reported by meissner@suse.deHigh 7
grub2 allowed attackers with access to the grub shell to access files on the encrypted disks.
Product
openSUSE Tumbleweed
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.suse.com
Apr 5, 2024GRUB2 does not call the module fini functions on exit, leading to Debian/Ubuntu's peimage GRUB2 module leaving UEFI system table hooks after exit.CVE-2024-2312 · Other software · Debian · reported by security@ubuntu.comMedium 6.7
GRUB2 does not call the module fini functions on exit, leading to Debian/Ubuntu's peimage GRUB2 module leaving UEFI system table hooks after exit. This lead to a use-after-free condition, and could possibly lead to secure boot bypass.
Product
Debian based GNU GRUB
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugs.launchpad.net cve.mitre.org
Feb 6, 2024A flaw was found in the grub2-set-bootflag utility of grub2.CVE-2024-1048 · Other software · Red Hat · reported by Red HatLow 3.3
A flaw was found in the grub2-set-bootflag utility of grub2. After the fix of CVE-2019-14865, grub2-set-bootflag will create a temporary file with the new grubenv content and rename it to the original grubenv file. If the program is killed before the rename operation, the temporary file will not be removed and may fill the filesystem when invoked multiple times, resulting in a filesystem out of free inodes or blocks.
Product
Red Hat Enterprise Linux 8
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Oct 25, 2023An out-of-bounds read flaw was found on grub2's NTFS filesystem driver.CVE-2023-4693 · Other software · Red Hat · reported by Red HatMedium 5.3
An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.
Product
Red Hat Enterprise Linux 8
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Oct 25, 2023An out-of-bounds write flaw was found in grub2's NTFS filesystem driver.CVE-2023-4692 · Other software · Red Hat · reported by Red HatHigh 7.5
An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.
Product
Red Hat Enterprise Linux 8
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Jul 19, 2023The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems.CVE-2022-28735 · Other software · GNU Project · reported by security@ubuntu.comMedium 6.7
The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain.
Product
GNU GRUB
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record cve.mitre.org security.netapp.com
Jul 19, 2023Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally moves its internal data buffer point by oneCVE-2022-28734 · Other software · GNU Project · reported by security@ubuntu.comHigh 8.1
Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write further when parsing the HTTP request, writing a NULL byte past the buffer. It's conceivable that an attacker controlled set of packets can lead to corruption of the GRUB2's internal memory metadata.
Product
GNU GRUB
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record cve.mitre.org security.netapp.com
Dec 19, 2022When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size.CVE-2022-3775 · Other software · GNU · reported by Red HatHigh 7.1
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com security.gentoo.org
Dec 14, 2022A buffer overflow was found in grub_font_construct_glyph().CVE-2022-2601 · Other software · GNU · reported by Red HatHigh 8.6
A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com security.gentoo.org
Jul 6, 2022A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap.CVE-2021-3697 · Other software · GNU · reported by Red HatHigh 7
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com security.gentoo.org
Jul 6, 2022A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader.CVE-2021-3696 · Other software · GNU · reported by Red HatMedium 4.5
A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com security.gentoo.org
Jul 6, 2022A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area.CVE-2021-3695 · Other software · GNU · reported by Red HatMedium 4.5
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com security.gentoo.org
Mar 16, 2022A Insecure Temporary File vulnerability in grub-once of grub2 in SUSE Linux Enterprise Server 15 SP4, openSUSE Factory allows local attackers to truncate arbitrCVE-2021-46705 · Other software · SUSE · reported by meissner@suse.deMedium 5.1
A Insecure Temporary File vulnerability in grub-once of grub2 in SUSE Linux Enterprise Server 15 SP4, openSUSE Factory allows local attackers to truncate arbitrary files. This issue affects: SUSE Linux Enterprise Server 15 SP4 grub2 versions prior to 2.06-150400.7.1. SUSE openSUSE Factory grub2 versions prior to 2.06-18.1.
Product
SUSE Linux Enterprise Server 15 SP4
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.suse.com bugzilla.suse.com
Mar 10, 2022A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read CVE-2021-3981 · Other software · GNU · reported by Red HatLow 3.3
A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record openwall.com bugzilla.redhat.com
Mar 15, 2021If certificates that signed grub are installed into db, grub can be booted directly.CVE-2021-3418 · Other software · GNU · reported by Red HatMedium 6.4
If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com bugzilla.redhat.com
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2021-20233 · Other software · GNU · reported by Red HatHigh 8.2
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2021-20225 · Other software · GNU · reported by Red HatMedium 6.7
A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2020-27779 · Other software · GNU · reported by Red HatHigh 7.5
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2020-27749 · Other software · GNU · reported by Red HatMedium 6.7
A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2020-25647 · Other software · GNU · reported by Red HatHigh 7.6
A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06.CVE-2020-25632 · Other software · GNU · reported by Red HatHigh 8.2
A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.fedoraproject.org
Mar 3, 2021A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled.CVE-2020-14372 · Other software · GNU · reported by Red HatHigh 7.5
A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Dec 10, 2020Two vulnerabilities in ArubaOS GRUB2 implementation allows for an attacker to bypass secureboot.CVE-2020-24637 · Other software · Arubanetworks · reported by security-alert@hpe.comHigh 7.2
Two vulnerabilities in ArubaOS GRUB2 implementation allows for an attacker to bypass secureboot. Successful exploitation of this vulnerability this could lead to remote compromise of system integrity by allowing an attacker to load an untrusted or modified kernel in Aruba 9000 Gateway; Aruba 7000 Series Mobility Controllers; Aruba 7200 Series Mobility Controllers version(s): 2.1.0.1, 2.2.0.0 and below; 6.4.4.23, 6.5.4.17, 8.2.2.9, 8.3.0.13, 8.5.0.10, 8.6.0.5, 8.7.0.0 and below ; 6.4.4.23, 6.5.4.17, 8.2.2.9, 8.3.0.13, 8.5.0.10, 8.6.0.5, 8.7.0.0 and below.
Product
Arubaos
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record support.hpe.com support.hpe.com
Jul 31, 2020There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems.CVE-2020-14311 · Other software · The Grub2 Project · reported by Red HatMedium 5.7
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Jul 31, 2020There is an issue on grub2 before version 2.06 at function read_section_as_string().CVE-2020-14310 · Other software · The Grub2 Project · reported by Red HatMedium 5.7
There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.
Product
grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Jul 30, 2020There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size.CVE-2020-14309 · Other software · GNU · reported by Red HatMedium 6.7
There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.
Product
Grub2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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