CVE-2021-20233
moderate-risk
Published 2021-03-03
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Do I need to act?
-
0.17% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.2/10
High
LOCAL
/ LOW complexity
Affected Products (20)
Affected Vendors
References (8)
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1926263
Third Party Advisory
https://security.gentoo.org/glsa/202104-05
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1926263
Third Party Advisory
https://security.gentoo.org/glsa/202104-05
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/
46
/ 100
moderate-risk
Severity
25/34 · High
Exploitability
1/34 · Minimal
Exposure
20/34 · Moderate