CVE-2011-2666

    Dashboard / Vulnerabilities / CVE-2011-2666

    CVE-2011-2666

    Published: 6 Jul 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The default configuration of the SIP channel driver in Asterisk Open Source 1.4.x through 1.4.41.2 and 1.6.2.x through 1.6.2.18.2 does not enable the alwaysauthreject option, which allows remote attackers to enumerate account names by making a series of invalid SIP requests and observing the differences in the responses for different usernames, a different vulnerability than CVE-2011-2536.

    References: http://downloads.asterisk.org/pub/security/AST-2011-011.html, https://exchange.xforce.ibmcloud.com/vulnerabilities/68472

    Affected packages

    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-2011-2666 | CVE-DB