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CVE-2021-21375

6.5 · 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 Mar 10, 2021CWE-400EPSS 2.08%

Overview

CVE-2021-21375 is a medium-severity vulnerability. It was published on March 10, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, 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 version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.

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/97b3d7addbaa720b7ddb0af9bf6f3e443e664365GitHubgithub.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvpReflists.debian.org/debian-lts-announce/2021/04/msg00023.htmlReflists.debian.org/debian-lts-announce/2021/05/msg00020.htmlRefsecurity.gentoo.org/glsa/202107-42GitHubgithub.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365GitHubgithub.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvpReflists.debian.org/debian-lts-announce/2021/04/msg00023.htmlReflists.debian.org/debian-lts-announce/2021/05/msg00020.htmlRefsecurity.gentoo.org/glsa/202107-42

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21375?

CVE-2021-21375 is a medium-severity vulnerability. It was published on March 10, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-21375?

This vulnerability has a CVSS 3.1 base score of 6.5, 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-2021-21375?

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-2021-21375?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21375 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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