CVEs / CVE-2010-3765
CVE-2010-3765: Mozilla Multiple Products Remote Code Execution Vulnerability
- Known exploited in the CISA KEV catalog since 6 Oct 2025
- high 9.3 CVSS 2.0 (NVD)
- EPSS 83.1% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Mozilla Firefox, SeaMonkey, and Thunderbird contain an unspecified vulnerability when JavaScript is enabled. This 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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a n/a | n/a | — |
Exploitation
| In CISA KEV since | 6 Oct 2025 |
|---|---|
| Due date for US federal agencies | 27 Oct 2025 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 2.0 | 9.3 highAV:N/AC:M/Au:N/C:C/I:C/A:CScored by NVD |
|---|---|
| Weakness | CWE-119 |
References
- CVE-2010-3765 on NVD
- CVE-2010-3765 in the CISA KEV catalog
- https://www.mozilla.org/en-US/security/advisories/mfsa2010-73 (cited by CISA)
- http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/ Vendor Advisory
- http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox Broken Link
- http://isc.sans.edu/diary.html?storyid=9817 Press/Media Coverage
- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050233.html Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.html Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.html Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.html Third Party Advisory
- http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter Product
- http://secunia.com/advisories/41761 Vendor Advisory
- http://secunia.com/advisories/41965 Vendor Advisory
- http://secunia.com/advisories/41966 Vendor Advisory
- http://secunia.com/advisories/41969 Vendor Advisory
- http://secunia.com/advisories/41975 Vendor Advisory
- http://secunia.com/advisories/42003 Vendor Advisory
- http://secunia.com/advisories/42008 Vendor Advisory
- http://secunia.com/advisories/42043 Vendor Advisory
- http://secunia.com/advisories/42867 Vendor Advisory
- http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.556706 Third Party Advisory
- http://support.avaya.com/css/P8/documents/100114329 Third Party Advisory
- http://support.avaya.com/css/P8/documents/100114335 Third Party Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.