CVE-2021-26713

    Dashboard / Vulnerabilities / CVE-2021-26713

    CVE-2021-26713

    Published: 19 Feb 2021Last Modified: 9 Jul 2026

    Summary:

    Details: A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.

    References: https://downloads.asterisk.org/pub/security/, https://downloads.asterisk.org/pub/security/AST-2021-004.html, https://issues.asterisk.org/jira/browse/ASTERISK-29205

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- a65908f83e2f17a3aca7eb39c8e06045aca02674
    Fixed -3cd8afbdf2c6dffe80c631a5336e21bb1827a5cd

    Affected versions

    16.8-NA

    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-2021-26713 | CVE-DB