CVE-2006-6499: Canonical Ubuntu Linux

Medium severity, CVSS 4.3. EPSS: 3.9% chance of exploitation in the next 30 days.

The js_dtoa function in Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 overwrites memory instead of exiting when the floating point precision is reduced, which allows remote attackers to cause a denial of service via any plugins that reduce the precision.

Affected products

• Canonical Ubuntu Linux: version 5.10 only; version 6.06 only; version 6.10 only
• Debian Debian Linux: version 3.1 only; version 4.0 only
• Mozilla Firefox: from 1.5, before 1.5.0.9 (fixed in 1.5.0.9); from 2.0, before 2.0.0.1 (fixed in 2.0.0.1)
• Mozilla Seamonkey: before 1.0.7 (fixed in 1.0.7)
• Mozilla Thunderbird: before 1.5.0.9 (fixed in 1.5.0.9)

Published 2006-12-20. Last modified 2026-06-16.