CVE-2012-4204: Canonical Ubuntu Linux

High severity, CVSS 9.3. EPSS: 5.8% chance of exploitation in the next 30 days.

The str_unescape function in the JavaScript engine in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via unspecified vectors.

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 (fixed in 17.0)
• Mozilla Seamonkey: before 2.14 (fixed in 2.14)
• Mozilla Thunderbird: before 17.0 (fixed in 17.0)
• 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 10 only; version 11 only

Published 2012-11-21. Last modified 2026-06-16.