CVE-2012-0464: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 4% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the browser engine in Mozilla Firefox before 3.6.28 and 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird before 3.1.20 and 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 allows remote attackers to execute arbitrary code via vectors involving an empty argument to the array.join function in conjunction with the triggering of garbage collection.

Affected products

• Mozilla Firefox: up to and including 3.6.27; from 4.0, up to and including 10.0; version 10.0 only; version 10.0.1 only; version 10.0.2 only
• Mozilla Seamonkey: affected versions not specified; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …
• Mozilla Thunderbird: from 1.0, up to and including 3.1.19; after 5.0, up to and including 10.0
• Mozilla Thunderbird ESR: version 10.0 only; version 10.0.1 only; version 10.0.2 only

Published 2012-03-14. Last modified 2026-06-16.