Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV L L L N U H H H 7.8 .9996 100.0 YES
AFFECTED Product Versions Fixed n/a n/a – —
TIMELINE Jan 15 Reserved by mitre Jan 26 Published (CNA: mitre) Apr 6 Added to CISA KEV, remediation due 2022-04-27
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.
| Date | Event | Detail |
|---|---|---|
| January 15, 2021 | Reserved | Reserved by mitre |
| January 26, 2021 | Published | Published (CNA: mitre) |
| April 6, 2022 | KEV ADDED | Added to CISA KEV, remediation due 2022-04-27 |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| n/a | n/a | — | n/a | — |
Authoritative record: CVE-2021-3156 at cve.org
Weaknesses: CWE-193
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3156 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
