CVE-2012-3973: Mozilla Firefox

High severity, CVSS 7.6. EPSS: 4.9% chance of exploitation in the next 30 days.

The debugger in the developer-tools subsystem in Mozilla Firefox before 15.0, when remote debugging is disabled, does not properly restrict access to the remote-debugging service, which allows remote attackers to execute arbitrary code by leveraging the presence of the HTTPMonitor extension and connecting to that service through the HTTPMonitor port.

Affected products

• Mozilla Firefox: up to and including 14.0; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …

Published 2012-08-29. Last modified 2026-06-16.