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    CVE-2021-43845

    PJSIP is a free and open source multimedia communication library. In version 2.11.1 and prior, if incoming RTCP XR message contain block, the data field is not checked against the received packet size, potentially resulting in an out-of-bound read access. This affects all users that use PJMEDIA and RTCP XR. A malicious actor can send a RTCP XR message with an invalid packet size.

    Published:Dec 27, 2021
    Last Modified:Nov 4, 2025
    EPS:Dec 27, 2021
    EPSS Score:0.00232
    CVSS Score:8.2

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Teluu
    Product
    Pjsip

    Exploits

    https://github.com/pjsip/pjproject/pull/2924https://github.com/pjsip/pjproject/pull/2924

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

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    References

    https://github.com/pjsip/pjproject/commit/f74c1fc22b760d2a24369aa72c74c4a9ab985859
    https://github.com/pjsip/pjproject/pull/2924
    https://github.com/pjsip/pjproject/security/advisories/GHSA-r374-qrwv-86hh
    https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
    https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
    https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
    https://security.gentoo.org/glsa/202210-37
    https://www.debian.org/security/2022/dsa-5285
    https://github.com/pjsip/pjproject/commit/f74c1fc22b760d2a24369aa72c74c4a9ab985859
    https://github.com/pjsip/pjproject/pull/2924
    https://github.com/pjsip/pjproject/security/advisories/GHSA-r374-qrwv-86hh
    https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html
    https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
    https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
    https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
    https://security.gentoo.org/glsa/202210-37
    https://www.debian.org/security/2022/dsa-5285

    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