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 STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
History

Tue, 04 Nov 2025 16:30:00 +0000

Type Values Removed Values Added
References

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2021-12-22T00:00:00.000Z

Updated: 2025-11-04T16:09:17.025Z

Reserved: 2021-07-29T00:00:00.000Z

Link: CVE-2021-37706

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-12-22T18:15:07.487

Modified: 2025-11-04T16:15:43.010

Link: CVE-2021-37706

cve-icon Redhat

No data.