CVE-2021-43804

7.3 HIGH
Published: December 22, 2021 Modified: November 04, 2025

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e
Source: security-advisories@github.com
Patch Third Party Advisory
https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9
Source: security-advisories@github.com
Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
Source: security-advisories@github.com
Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
Source: security-advisories@github.com
Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202210-37
Source: security-advisories@github.com
Third Party Advisory
https://www.debian.org/security/2022/dsa-5285
Source: security-advisories@github.com
Third Party Advisory
https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202210-37
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.debian.org/security/2022/dsa-5285
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

15 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.3 / 10.0
EPSS (Exploit Probability)
0.3%
55th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

debian teluu