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.
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History
Tue, 04 Nov 2025 16:30:00 +0000
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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
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Status : Modified
Published: 2021-12-22T18:15:07.487
Modified: 2025-11-04T16:15:43.010
Link: CVE-2021-37706
No data.