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    CVE-2009-2726

    The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.

    Published:Aug 12, 2009
    Last Modified:Apr 23, 2026
    EPS:Aug 12, 2009
    EPSS Score:0.3069
    CVSS Score:7.8

    Affected Products

    Vendor
    Digium
    Product
    Asterisk
    Vendor
    Digium
    Product
    S800i
    Vendor
    Digium
    Product
    S800i Firmware

    Exploits

    http://www.securityfocus.com/bid/36015http://www.securityfocus.com/bid/36015

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    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