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CVE-2021-43804

7.3 · HIGH

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE.

Published Dec 22, 2021CWE-125EPSS 2.13%

Overview

CVE-2021-43804 is a high-severity vulnerability. It was published on December 22, 2021 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming RTCP BYE message contains a reason's length, this declared length is not checked against the actual received packet size, potentially resulting in an out-of-bound read access. This issue affects all users that use PJMEDIA and RTCP. A malicious actor can send a RTCP BYE message with an invalid reason length. Users are advised to upgrade as soon as possible. There are no known workarounds.

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

GitHubgithub.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1eGitHubgithub.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9Reflists.debian.org/debian-lts-announce/2022/03/msg00035.htmlReflists.debian.org/debian-lts-announce/2022/11/msg00021.htmlReflists.debian.org/debian-lts-announce/2023/08/msg00038.htmlRefsecurity.gentoo.org/glsa/202210-37Refwww.debian.org/security/2022/dsa-5285GitHubgithub.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1eGitHubgithub.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9Reflists.debian.org/debian-lts-announce/2022/03/msg00035.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43804?

CVE-2021-43804 is a high-severity vulnerability. It was published on December 22, 2021 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2021-43804?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2021-43804?

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-2021-43804?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43804 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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