CVE-2013-2099

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    CVE-2013-2099

    Published: 9 Oct 2013Last Modified: 16 Apr 2026
    Aliases:
    PSF-2013-1

    Summary:

    Details: Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of python-backports-ssl_match_hostname as used for older Python versions, allows remote attackers to cause a denial of service (CPU consumption) via multiple wildcard characters in the common name in a certificate.

    References: http://rhn.redhat.com/errata/RHSA-2014-1690.html, http://secunia.com/advisories/55107, http://secunia.com/advisories/55116, http://www.ubuntu.com/usn/USN-1983-1, http://www.ubuntu.com/usn/USN-1984-1, http://www.ubuntu.com/usn/USN-1985-1, https://access.redhat.com/errata/RHSA-2016:1166, http://bugs.python.org/issue17980, https://bugzilla.redhat.com/show_bug.cgi?id=963260, http://www.openwall.com/lists/oss-security/2013/05/16/6

    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-2013-2099 | CVE-DB