CVE-2013-6422

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    CVE-2013-6422

    Published: 23 Dec 2013Last Modified: 10 Apr 2026

    Summary:

    Details: The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.

    References: http://curl.haxx.se/docs/adv_20131217.html, http://www.debian.org/security/2013/dsa-2824, http://www.ubuntu.com/usn/USN-2058-1, http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html, https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322

    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-2013-6422 | CVE-DB