CVE-2021-3156

HighCVSS 7.8/10Known exploited (CISA KEV)Last modified Jun 17, 2026

Description

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-193

Affected software

No affected versions have been published.

Timeline

Published: Jan 26, 2021
Last modified: Jun 17, 2026
Added to CISA KEV: Apr 6, 2022
NVD status: Analyzed

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