CVE-2020-27749

MediumCVSS 6.7/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.7/10CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-121 CWE-787

Affected software

Vendor	Product	Versions
n/a	grub2	grub 2.06

References

https://bugzilla.redhat.com/show_bug.cgi?id=1899966Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://security.gentoo.org/glsa/202104-05Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1899966Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
https://security.gentoo.org/glsa/202104-05Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/Third Party Advisory

Timeline

Published: Mar 3, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

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