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CVE-2021-3518

8.8 · HIGH

There's a flaw in libxml2 in versions before 2.9.11.

Published May 18, 2021CWE-416EPSS 21.86%

Overview

CVE-2021-3518 is a high-severity vulnerability. It was published on May 18, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refseclists.org/fulldisclosure/2021/Jul/54Refseclists.org/fulldisclosure/2021/Jul/55Refseclists.org/fulldisclosure/2021/Jul/58Refseclists.org/fulldisclosure/2021/Jul/59Refbugzilla.redhat.com/show_bug.cgi?id=1954242Reflists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReflists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReflists.debian.org/debian-lts-announce/2021/05/msg00008.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3518?

CVE-2021-3518 is a high-severity vulnerability. It was published on May 18, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-3518?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-3518?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3518?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3518 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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