What’s Vulnerable › Vulnerabilities

CVE-2008-5014

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2008-11-13 · updated 2026-06-16
• Weakness: CWE-20

Description

jslock.cpp in Mozilla Firefox 3.x before 3.0.2, 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 the window.__proto__.__proto__ object in a way that causes a lock on a non-native object, which triggers an assertion failure related to the OBJ_IS_NATIVE function.

Affected products

• Canonical Ubuntu Linux: 6.06, 7.10, 8.04, 8.10
• Debian Linux: 4.0
• Mozilla Firefox: from 2.0 before 2.0.0.18; from 3.0 before 3.0.2 — fixed in 2.0.0.18, 3.0.2
• 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

How to fix

Upgrade to a fixed version: Mozilla Firefox 2.0.0.18, 3.0.2; Mozilla Seamonkey 1.1.13; Mozilla Thunderbird 2.0.0.18. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2008-11/msg00004.html
• http://secunia.com/advisories/32011
• http://secunia.com/advisories/32684
• http://secunia.com/advisories/32693
• http://secunia.com/advisories/32694
• http://secunia.com/advisories/32695
• http://secunia.com/advisories/32714
• http://secunia.com/advisories/32715
• http://secunia.com/advisories/32721
• http://secunia.com/advisories/32778
• http://secunia.com/advisories/32798
• http://secunia.com/advisories/32845

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