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CVE-2021-3517

Publication date 19 May 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.6 · High

Score breakdown

There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application.

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
Fixed 2.9.4+dfsg1-6.1ubuntu1.4
16.04 LTS xenial
14.04 LTS trusty

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Notes

ccdm94

same patch as the one for CVE-2020-24977. As per a comment made by upstream in issue 235 (related to this CVE) both the issues fixed by bf22713507 are caused by the same underlying problem.

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