CVE-2021-27135

Publication date 10 February 2021

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

Description

xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.

Status

Package Ubuntu Release Status
xterm 20.10 groovy
Fixed 353-1ubuntu1.20.10.2
20.04 LTS focal
Fixed 353-1ubuntu1.20.04.2
18.04 LTS bionic
Fixed 330-1ubuntu2.2
16.04 LTS xenial
Fixed 322-1ubuntu1.2
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
xterm

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references