CVE-2021-20233: fedoraproject fedora Out-of-bounds Write

Vulnerability summary

CVE-2021-20233 is a high (CVSS 8.2) Out-of-bounds Write vulnerability in fedoraproject fedora. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 47.8% of scored vulnerabilities.

Timeline

1. 03-03-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.