CVE-2021-3156

Publication date 26 January 2021

Last updated 21 August 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
sudo	20.10 groovy	Fixed 1.9.1-1ubuntu1.1
	20.04 LTS focal	Fixed 1.8.31-1ubuntu1.2
	18.04 LTS bionic	Fixed 1.8.21p2-3ubuntu1.4
	16.04 LTS xenial	Fixed 1.8.16-0ubuntu1.10
	14.04 LTS trusty	Fixed 1.8.9p5-1ubuntu1.5+esm6 Ubuntu Pro

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2021-3156

Cvss 3 Severity Score

Status

Get expanded security coverage with Ubuntu Pro

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references