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CVE-2021-3156: Sudo Heap-Based Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2021-3156
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.

CSIRTS triage

vendor: Sudoproduct: SudoPrivilege escalation
What
An off-by-one error can result in a heap-based buffer overflow, allowing privilege escalation.
Who is affected
Users of Sudo are affected.
Urgency
Immediate remediation is necessary due to active exploitation of the vulnerability.
Action
Update to the latest version of Sudo.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-04-06
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-3156

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-3156coverage & exploitation statusNVD · CVE.org

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