What’s Vulnerable › Vulnerabilities

CVE-2014-8639

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-01-14 · updated 2026-06-17

Description

Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 do not properly interpret Set-Cookie headers within responses that have a 407 (aka Proxy Authentication Required) status code, which allows remote HTTP proxy servers to conduct session fixation attacks by providing a cookie name that corresponds to the session cookie of the origin server.

Affected products

• Mozilla Firefox: through 34.0.5; 31.0, 31.1.0, 31.1.1, 31.3.0
• Mozilla Firefox ESR: 31.2
• Mozilla Seamonkey: through 2.31
• Mozilla Thunderbird: through 31.3.0

References

• http://linux.oracle.com/errata/ELSA-2015-0046.html
• http://linux.oracle.com/errata/ELSA-2015-0047.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00014.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00032.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00033.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00036.html
• http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00002.html
• http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
• http://lists.opensuse.org/opensuse-updates/2015-01/msg00071.html
• http://rhn.redhat.com/errata/RHSA-2015-0046.html
• http://rhn.redhat.com/errata/RHSA-2015-0047.html
• http://secunia.com/advisories/62237

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