CVE-2020-27749

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.

• CWE-121
• CWE-787

• 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

Published

Mar 3, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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