CVE-2021-3156
CVSS v3
7.8
HIGH
EPSS Score
92.5 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2022-04-06
- Patch Due Date
- 2022-04-27
- Ransomware Use
- Unknown
Frequently asked questions
What is CVE-2021-3156?
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.
Is CVE-2021-3156 actively exploited?
Yes. CVE-2021-3156 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-27.
What is the CVSS score for CVE-2021-3156?
CVE-2021-3156 has a CVSS v3 base score of 7.8 (HIGH severity).
Is CVE-2021-3156 affecting your environment?
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