vulnerability
Arch Linux: Arbitrary code execution (CVE-2021-20233)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:L/Au:N/C:C/I:C/A:C) | Mar 3, 2021 | Jul 11, 2025 | Nov 27, 2025 |
Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
Mar 3, 2021
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
There's a flaw in GRUB2 menu rendering code setparam_prefix() in the menu rendering code. It performs a length calculation under the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters. This allow an attacker to corrupt memory by one byte for each quote in the input.
Solution
arch-linux-upgrade-latest
References
- CVE-2021-20233
- https://attackerkb.com/topics/CVE-2021-20233
- URL-https://bugzilla.redhat.com/show_bug.cgi?id=1926263
- URL-https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- URL-https://security.archlinux.org/ASA-202106-43
- URL-https://security.gentoo.org/glsa/202104-05
- URL-https://security.netapp.com/advisory/ntap-20220325-0001/
- CWE-787
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