CVE-2021-3541

Publication date 18 May 2021

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

Description

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

Read the notes from the security team

Status

Package Ubuntu Release Status
libxml2 22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Fixed 2.9.10+dfsg-6.3ubuntu0.1
20.10 groovy
Fixed 2.9.10+dfsg-5ubuntu0.20.10.2
20.04 LTS focal
Fixed 2.9.10+dfsg-5ubuntu0.20.04.1
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

avital

Not reproducible in 2.9.4+dfsg1-6.1 and prior

Patch details

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

Package Patch details
libxml2

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references