What’s Vulnerable › Vulnerabilities

CVE-2006-6499

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2006-12-20 · updated 2026-06-16
• Weakness: CWE-835

Description

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: 5.10, 6.06, 6.10
• Debian Linux: 3.1, 4.0
• Mozilla Firefox: from 1.5 before 1.5.0.9; from 2.0 before 2.0.0.1 — fixed in 1.5.0.9, 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

How to fix

Upgrade to a fixed version: Mozilla Firefox 1.5.0.9, 2.0.0.1; Mozilla Seamonkey 1.0.7; Mozilla Thunderbird 1.5.0.9. Check the vendor advisory for mitigations.

References

• http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00771742
• http://secunia.com/advisories/23282
• http://secunia.com/advisories/23420
• http://secunia.com/advisories/23422
• http://secunia.com/advisories/23545
• http://secunia.com/advisories/23589
• http://secunia.com/advisories/23591
• http://secunia.com/advisories/23614
• http://secunia.com/advisories/23672
• http://secunia.com/advisories/23692
• http://secunia.com/advisories/23988
• http://secunia.com/advisories/24078

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