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CVE-2021-32686

5.9 · MEDIUM

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 Jul 23, 2021CWE-362EPSS 2.07%

Overview

CVE-2021-32686 is a medium-severity vulnerability. It was published on July 23, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. 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 PJSIP before version 2.11.1, there are a couple of issues found in the SSL socket. First, a race condition between callback and destroy, due to the accepted socket having no group lock. Second, the SSL socket parent/listener may get destroyed during handshake. Both issues were reported to happen intermittently in heavy load TLS connections. They cause a crash, resulting in a denial of service. These are fixed in version 2.11.1.

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/d5f95aa066f878b0aef6a64e60b61e8626e664cdGitHubgithub.com/pjsip/pjproject/pull/2716GitHubgithub.com/pjsip/pjproject/releases/tag/2.11.1GitHubgithub.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wrReflists.debian.org/debian-lts-announce/2022/03/msg00035.htmlRefsecurity.gentoo.org/glsa/202210-37Refwww.debian.org/security/2021/dsa-4999GitHubgithub.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cdGitHubgithub.com/pjsip/pjproject/pull/2716GitHubgithub.com/pjsip/pjproject/releases/tag/2.11.1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32686?

CVE-2021-32686 is a medium-severity vulnerability. It was published on July 23, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2021-32686?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32686?

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-2021-32686?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32686 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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