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CVE-2021-3156
CWE-193
Critical
91.8
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
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.
Source: NVD
Signals
- CVSS
- 7.8
- High · v3.1
- EPSS
- 99.96%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Apr 2022
- Fix commit
- Fix commit known
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-193
- Published
- 26 Jan 2021
- Last modified 10 Nov 2025
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
curl -H "Authorization: Bearer dsec_live_xxxxxxxx" \
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Data as of 7 Oct 2026, 05:16 UK time