Medium severity6.7NVD Advisory· Published Mar 3, 2021· Updated Jun 17, 2026
CVE-2020-27749
CVE-2020-27749
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
41- grub2/grub2description
- osv-coords39 versionspkg:rpm/almalinux/shim-aa64pkg:rpm/almalinux/shim-ia32pkg:rpm/almalinux/shim-unsigned-aarch64pkg:rpm/almalinux/shim-unsigned-x64pkg:rpm/almalinux/shim-x64pkg:rpm/opensuse/grub2&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/grub2&distro=openSUSE%20Tumbleweedpkg:rpm/suse/grub2&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/grub2&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/grub2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/grub2&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/suse/grub2&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/grub2&distro=SUSE%20Manager%20Server%204.0pkg:rpm/suse/grub2&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/grub2&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/grub2&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/grub2&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/grub2&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 15.4-2.el8_1.alma+ 38 more
- (no CPE)range: < 15.4-2.el8_1.alma
- (no CPE)range: < 15.4-2.el8_1.alma
- (no CPE)range: < 15-7.el8_1.alma
- (no CPE)range: < 15.4-4.el8_1.alma
- (no CPE)range: < 15.4-2.el8_1.alma
- (no CPE)range: < 2.04-lp152.7.22.7
- (no CPE)range: < 2.06-7.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-19.66.1
- (no CPE)range: < 2.02-19.66.1
- (no CPE)range: < 2.04-9.34.1
- (no CPE)range: < 2.04-9.34.1
- (no CPE)range: < 2.02-0.66.26.1
- (no CPE)range: < 2.02-115.59.1
- (no CPE)range: < 2.02-115.59.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-12.47.1
- (no CPE)range: < 2.02-12.47.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-19.66.1
- (no CPE)range: < 2.02-115.59.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-12.47.1
- (no CPE)range: < 2.02-12.47.1
- (no CPE)range: < 2.02-19.66.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-26.43.1
- (no CPE)range: < 2.02-115.59.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-12.47.1
- (no CPE)range: < 2.02-4.69.1
- (no CPE)range: < 2.02-12.47.1
Patches
Vulnerability mechanics
References
4- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- security.gentoo.org/glsa/202104-05nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20220325-0001/nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/nvd
News mentions
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