CVE-2020-27749 Details
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 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1899966 | CVE | Issue TrackingPatchThird Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/ | CVE | |
| https://security.gentoo.org/glsa/202104-05 | CVE | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220325-0001/ | CVE | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1899966 | [email protected] | Issue TrackingPatchThird Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/ | [email protected] | |
| https://security.gentoo.org/glsa/202104-05 | [email protected] | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220325-0001/ | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| gnu grub2 | < 2.06 |
CPE
Remediation
| |
| redhat enterprise linux | 7.0 8.0 |
CPE
Remediation
| |
| redhat enterprise linux server aus | 7.2 7.3 7.4 7.6 7.7 8.2 |
CPE
Remediation
| |
| redhat enterprise linux server eus | 7.6 7.7 8.1 |
CPE
Remediation
| |
| redhat enterprise linux server tus | 7.4 7.6 7.7 8.2 |
CPE
Remediation
| |
| redhat enterprise linux workstation | 7.0 |
CPE
Remediation
| |
| fedoraproject fedora | 33 34 |
CPE
Remediation
| |
| netapp ontap select deploy administration utility | All versions |
CPE
Remediation
| |
Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Nov 21, 2024 | CVE Modified | CVE |
| May 14, 2024 | CVE Modified | [email protected] |
| Nov 7, 2023 | CVE Modified | [email protected] |
| May 13, 2022 | Modified Analysis | [email protected] |
| Mar 25, 2022 | CVE Modified | [email protected] |
| May 1, 2021 | CVE Modified | [email protected] |
| Apr 23, 2021 | CVE Modified | [email protected] |
| Mar 10, 2021 | Initial Analysis | [email protected] |