Back to CVE records
Critical 9.8Known exploited (CISA KEV)Published Oct 27, 2010
CVE-2010-3765Mozilla 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 attac…
Updated under an hour ago ()
Does this affect you?
It affects mozilla firefox and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Oct 6, 2025; federal agencies had to remediate by Oct 27, 2025. Treat that date as your deadline.
Do this next
Start free and add your stack
Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-119
- Known exploited
- Added to CISA KEV Oct 6, 2025; federal remediation due Oct 27, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 83.16% (percentile 100)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 22, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
mozilla firefox mozilla:firefox | 3.5; 3.5.1; 3.5.2; 3.5.3; 3.5.4; 3.5.5; 3.5.6; 3.5.7; and 17 more ranges | NVD |
mozilla thunderbird mozilla:thunderbird | 3.0.1; 3.0.2; 3.0.3; 3.0.4; 3.0.5; 3.0.6; 3.0.7; 3.0.8; and 6 more ranges | NVD |
mozilla seamonkey mozilla:seamonkey | 2.0; 2.0; 2.0; 2.0; 2.0; 2.0; 2.0; 2.0; and 9 more ranges | NVD |
References
- http://www.securityfocus.com/bid/44425vdb-entry, x-refsource-bid
- https://rhn.redhat.com/errata/RHSA-2010-0812.htmlvendor-advisory, x-refsource-redhat
- https://bugzilla.mozilla.org/show_bug.cgi?id=607222#c53x-refsource-misc
- http://www.vupen.com/english/advisories/2010/2837vdb-entry, x-refsource-vupen
- https://bugzilla.redhat.com/show_bug.cgi?id=646997x-refsource-confirm
- http://support.avaya.com/css/P8/documents/100114335x-refsource-confirm, third-party-advisory
- http://secunia.com/advisories/41965third-party-advisory, x-refsource-secunia, vendor-advisory
- http://secunia.com/advisories/41975third-party-advisory, x-refsource-secunia, vendor-advisory
- http://www.redhat.com/support/errata/RHSA-2010-0896.htmlvendor-advisory, x-refsource-redhat
- http://www.redhat.com/support/errata/RHSA-2010-0808.htmlvendor-advisory, x-refsource-redhat
- http://www.exploit-db.com/exploits/15341exploit, x-refsource-exploit-db
- http://www.securitytracker.com/id?1024651vdb-entry, x-refsource-sectrack
- http://secunia.com/advisories/41761third-party-advisory, x-refsource-secunia, vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=607222x-refsource-confirm
- http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050233.htmlvendor-advisory, x-refsource-fedora, third-party-advisory
- http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitterx-refsource-misc, product
- http://secunia.com/advisories/41969third-party-advisory, x-refsource-secunia, vendor-advisory
- http://www.ubuntu.com/usn/USN-1011-3vendor-advisory, x-refsource-ubuntu
- http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefoxx-refsource-confirm, broken-link
- http://www.norman.com/about_norman/press_center/news_archive/2010/129223/x-refsource-misc
- http://www.ubuntu.com/usn/usn-1011-1vendor-advisory, x-refsource-ubuntu
- http://www.securitytracker.com/id?1024650vdb-entry, x-refsource-sectrack
- http://www.ubuntu.com/usn/USN-1011-2vendor-advisory, x-refsource-ubuntu
- http://www.redhat.com/support/errata/RHSA-2010-0809.htmlvendor-advisory, x-refsource-redhat
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:219vendor-advisory, x-refsource-mandriva
- http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/vendor-advisory
- http://isc.sans.edu/diary.html?storyid=9817press/media-coverage
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.htmlthird-party-advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.htmlthird-party-advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.htmlthird-party-advisory
- http://secunia.com/advisories/41966vendor-advisory
- http://secunia.com/advisories/42003vendor-advisory
- http://secunia.com/advisories/42008vendor-advisory
- http://secunia.com/advisories/42043vendor-advisory
- http://secunia.com/advisories/42867vendor-advisory
- http://slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.556706third-party-advisory
- http://support.avaya.com/css/P8/documents/100114329third-party-advisory
- http://www.debian.org/security/2010/dsa-2124third-party-advisory
- http://www.exploit-db.com/exploits/15342exploit
- http://www.exploit-db.com/exploits/15352exploit
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.