CVE-2010-3765
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…
Browse: All 2010 CVEs · All vendors
- CVSS score
- 9.8 Critical
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- CISA KEV
- Yes — actively exploited (added 2025-10-06, remediation due 2025-10-27)
- Weakness (CWE)
- CWE-119
- Published
- 2010-10-28
- Last modified
- 2026-06-16
- NVD status
- Analyzed
Description
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.
Affected products
- mozilla firefox
- mozilla thunderbird
- mozilla seamonkey
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Federal remediation deadline: 2025-10-27.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score.
References
- http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/
- 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.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.html
- http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter
FAQ
Is CVE-2010-3765 actively exploited?
Yes. CISA added CVE-2010-3765 to its Known Exploited Vulnerabilities (KEV) catalog on 2025-10-06, with a federal remediation deadline of 2025-10-27. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2010-3765?
CVE-2010-3765 has a CVSS base score of 9.8 (Critical). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Related vulnerabilities
- CVE-2024-9680 — Mozilla Firefox
- CVE-2016-9079 — Mozilla Firefox, Firefox ESR, and Thunderb
- CVE-2015-4495 — Mozilla Firefox
- CVE-2019-11707 — Mozilla Firefox and Thunderbird
- CVE-2019-11708 — Mozilla Firefox and Thunderbird
- CVE-2013-1690 — Mozilla Firefox and Thunderbird
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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