CVE-2011-2366: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Mozilla Gecko before 5.0, as used in Firefox before 5.0 and Thunderbird before 5.0, does not block use of a cross-domain image as a WebGL texture, which allows remote attackers to obtain approximate copies of arbitrary images via a timing attack involving a crafted WebGL fragment shader.

Affected products

• Mozilla Firefox: up to and including 4.0.1; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …
• Mozilla Gecko: up to and including 2; version 1.7 only; version 1.8 only; version 1.8.1 only; version 1.9 only; version 1.9.1 only; …
• Mozilla Thunderbird: up to and including 3.1.11; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2011-06-30. Last modified 2026-06-16.