UBUNTU-CVE-2021-3156
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UBUNTU-CVE-2021-3156
Published: 26 Jan 2021Last Modified: 4 Feb 2026
Upstream:
Aliases:
Summary:
Details: 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.
References: https://ubuntu.com/security/CVE-2021-3156, https://ubuntu.com/security/notices/USN-4705-1, https://ubuntu.com/security/notices/USN-4705-2, https://www.cve.org/CVERecord?id=CVE-2021-3156, https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Affected packages
Package
Name: sudo
Purl: pkg:deb/ubuntu/[email protected]+esm6?arch=source&distro=trusty/esm
Affected ranges
Type: ECOSYSTEM
Events:
Introduced- 0
Fixed -1.8.9p5-1ubuntu1.5+esm6
Affected versions
1.8.6p3-0ubuntu3
1.8.8-2ubuntu1
1.8.8-2ubuntu2
1.8.9p4-1ubuntu1
1.8.9p4-1ubuntu2
1.8.9p5-1ubuntu1
1.8.9p5-1ubuntu1.1
1.8.9p5-1ubuntu1.2
1.8.9p5-1ubuntu1.3
1.8.9p5-1ubuntu1.4
1.8.9p5-1ubuntu1.5+esm1
1.8.9p5-1ubuntu1.5+esm2
1.8.9p5-1ubuntu1.5+esm3
1.8.9p5-1ubuntu1.5+esm5
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
