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    CVE-2013-0776

    Mozilla Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17.x before 17.0.3, and SeaMonkey before 2.16 allow man-in-the-middle attackers to spoof the address bar by operating a proxy server that provides a 407 HTTP status code accompanied by web script, as demonstrated by a phishing attack on an HTTPS site.

    Published:Feb 19, 2013
    Last Modified:Apr 11, 2025
    EPS:Feb 19, 2013
    EPSS Score:0.00653
    CVSS Score:4

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Seamonkey
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Mozilla
    Product
    Thunderbird Esr
    Vendor
    Opensuse
    Product
    Opensuse
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation
    Vendor
    Redhat
    Product
    Rhel Productivity

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    References

    http://lists.opensuse.org/opensuse-security-announce/2013-02/msg00017.html
    http://lists.opensuse.org/opensuse-updates/2013-02/msg00062.html
    http://rhn.redhat.com/errata/RHSA-2013-0271.html
    http://rhn.redhat.com/errata/RHSA-2013-0272.html
    http://www.debian.org/security/2013/dsa-2699
    http://www.mozilla.org/security/announce/2013/mfsa2013-27.html
    http://www.ubuntu.com/usn/USN-1729-1
    http://www.ubuntu.com/usn/USN-1729-2
    http://www.ubuntu.com/usn/USN-1748-1
    https://bugzilla.mozilla.org/show_bug.cgi?id=796475
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16666
    http://lists.opensuse.org/opensuse-security-announce/2013-02/msg00017.html
    http://lists.opensuse.org/opensuse-updates/2013-02/msg00062.html
    http://rhn.redhat.com/errata/RHSA-2013-0271.html
    http://rhn.redhat.com/errata/RHSA-2013-0272.html
    http://www.debian.org/security/2013/dsa-2699
    http://www.mozilla.org/security/announce/2013/mfsa2013-27.html
    http://www.ubuntu.com/usn/USN-1729-1
    http://www.ubuntu.com/usn/USN-1729-2
    http://www.ubuntu.com/usn/USN-1748-1
    https://bugzilla.mozilla.org/show_bug.cgi?id=796475
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16666

    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