CVE-2008-5021: Canonical Ubuntu Linux

High severity, CVSS 9.3. EPSS: 3.6% chance of exploitation in the next 30 days.

nsFrameManager in Firefox 3.x before 3.0.4, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by modifying properties of a file input element while it is still being initialized, then using the blur method to access uninitialized memory.

Affected products

• Canonical Ubuntu Linux: version 6.06 only; version 7.10 only; version 8.04 only; version 8.10 only
• Debian Debian Linux: version 4.0 only
• Fedoraproject Fedora: version 8 only; version 9 only
• Mozilla Firefox: from 2.0, before 2.0.0.18 (fixed in 2.0.0.18); from 3.0, before 3.0.4 (fixed in 3.0.4)
• Mozilla Seamonkey: from 1.0, before 1.1.13 (fixed in 1.1.13)
• Mozilla Thunderbird: from 2.0, before 2.0.0.18 (fixed in 2.0.0.18)
• Novell Linux Desktop: version 9 only
• Novell Open Enterprise Server: affected versions not specified
• Opensuse Opensuse: version 10.2 only; version 10.3 only; version 11.0 only
• Suse Linux Enterprise Debuginfo: version 10 only
• Suse Linux Enterprise Desktop: version 10 only
• Suse Linux Enterprise Server: version 9 only; version 10 only
• Suse Linux Enterprise Software Development Kit: version 10 only

Published 2008-11-13. Last modified 2026-06-16.