CVE-2021-43804

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    CVE-2021-43804

    Published: 22 Dec 2021Last Modified: 9 Jul 2026

    Summary:

    Details: 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.

    References: https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html, https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html, https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html, https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html, https://security.gentoo.org/glsa/202210-37, https://www.debian.org/security/2022/dsa-5285, https://github.com/pjsip/pjproject/commit/8b621f192cae14456ee0b0ade52ce6c6f258af1e, https://github.com/pjsip/pjproject/security/advisories/GHSA-3qx3-cg72-wrh9

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.11.1
    2.11

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-43804 | CVE-DB