CVE-2021-26717

    Dashboard / Vulnerabilities / CVE-2021-26717

    CVE-2021-26717

    Published: 18 Feb 2021Last Modified: 8 Jul 2026

    Summary:

    Details: An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

    References: http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html, https://downloads.asterisk.org/pub/security/, https://downloads.asterisk.org/pub/security/AST-2021-002.html, http://seclists.org/fulldisclosure/2021/Feb/58, https://issues.asterisk.org/jira/browse/ASTERISK-29203

    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-2021-26717 | CVE-DB