CVE-2009-3371: Mozilla Firefox

High severity, CVSS 10.0. EPSS: 7.2% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Mozilla Firefox 3.5.x before 3.5.4 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code by creating JavaScript web-workers recursively.

Affected products

• Mozilla Firefox: version 3.5.1 only; version 3.5.2 only; version 3.5.3 only; version 3.5.4 only

Published 2009-10-29. Last modified 2026-06-16.