CVE-2021-3517

Description

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.

How to fix CVE-2021-3517

To remediate CVE-2021-3517, upgrade the affected package to a fixed version below.

• —upgrade to 2.9.9-r5 or later
• —upgrade to 2.9.10+dfsg-6.6 or later
• —upgrade to 1.11.4 or later

Is CVE-2021-3517 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 2.9.9-r5
• from 0, < 2.9.10+dfsg-6.6
• from 0, < 1.11.4

CVSS scores

References (20)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-3517
• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2021-3517
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-3517
• PATCHgithub.com/sparklemotion/nokogiri
• WEB