CVE-2021-26906

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    CVE-2021-26906

    Published: 18 Feb 2021Last Modified: 9 Jul 2026

    Summary:

    Details: An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

    References: http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html, https://downloads.asterisk.org/pub/security/, https://downloads.asterisk.org/pub/security/AST-2021-005.html, http://seclists.org/fulldisclosure/2021/Feb/61, https://issues.asterisk.org/jira/browse/ASTERISK-29196

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 85335355efb2d7914a1fe20ed31afcef15fd210c
    Fixed -fbaea22493a6061d4bdc87bddc0cb5971e5f71d9

    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-2021-26906 | CVE-DB