CVE-2010-3765
CRITICAL severity · CVSS 9.8 · Memory corruption · actively exploited (CISA KEV)
9.8CVSS CRITICAL ● exploited
🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2025-10-06. US federal agencies must patch by 2025-10-27.
Summary
Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x before 2.0.10, when JavaScript is enabled, allows remote attackers to execute arbitrary code via vectors related to nsCSSFrameConstructor::ContentAppended, the appendChild method, incorrect index tracking, and the creation of multiple frames, which triggers memory corruption, as exploited in the wild in October 2010 by the Belmoo malware.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)87%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/Advisory
- http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox
- http://isc.sans.edu/diary.html?storyid=9817
- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050233.htmlAdvisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.htmlAdvisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.htmlAdvisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.htmlAdvisory
- http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter