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CVE-2010-5074

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-12-07 · updated 2026-06-16
• Weakness: CWE-362

Description

The layout engine in Mozilla Firefox before 4.0, Thunderbird before 3.3, and SeaMonkey before 2.1 executes different code for visited and unvisited links during the processing of Cascading Style Sheets (CSS) token sequences, which makes it easier for remote attackers to obtain sensitive information about visited web pages via a timing attack.

Affected products

• Mozilla Firefox: through 3.6.24; 3.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5 (+51)
• Mozilla Seamonkey: through 2.1; 1.0, 1.0-alpha, 1.0-beta, 1.0.1, 1.0.2, 1.0.3 (+56)
• Mozilla Thunderbird: through 3.1.16; 3.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5 (+22)

References

• http://blog.mozilla.com/security/2010/03/31/plugging-the-css-history-leak/
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14456
• http://blog.mozilla.com/security/2010/03/31/plugging-the-css-history-leak/
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14456

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