CVE-2013-0764: Canonical Ubuntu Linux

High severity, CVSS 9.3. EPSS: 3.1% chance of exploitation in the next 30 days.

The nsSOCKSSocketInfo::ConnectToProxy function in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not ensure thread safety for SSL sessions, which allows remote attackers to execute arbitrary code via crafted data, as demonstrated by e-mail message data.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 11.10 only; version 12.04 only; version 12.10 only
• Mozilla Firefox: before 17.0.3 (fixed in 17.0.3); before 19.0 (fixed in 19.0)
• Mozilla Seamonkey: before 2.16 (fixed in 2.16)
• Mozilla Thunderbird: before 17.0.3 (fixed in 17.0.3)
• Mozilla Thunderbird ESR: before 17.0.3 (fixed in 17.0.3)
• Opensuse Opensuse: version 11.4 only; version 12.1 only; version 12.2 only
• Suse Linux Enterprise Desktop: version 10 only; version 11 only
• Suse Linux Enterprise Server: version 10 only; version 11 only
• Suse Linux Enterprise Software Development Kit: version 11 only

Published 2013-01-13. Last modified 2026-06-16.