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Fencer Intel
critical 9.8

CVE-2010-3765 kev in the critical feed json

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 be…

published 2010-10-27 16 y ago modified 2026-06-16 4 mo ago also EUVD-2010-3744

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2025-10-06
epss
83.2%
EPSS 83.2% chance of exploitation in 30 days, percentile 99.6%
public exploits
5
Metasploit, Exploit-DB

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.

Patch / fix

cisa 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.

  • thunderbird RHEL 6 3.1.6-1.el6_0
  • firefox RHEL 6 3.6.12-1.el6_0
  • xulrunner RHEL 6 1.9.2.12-1.el6_0
  • thunderbird RHEL 4 1.5.0.12-33.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.24-10.el5_5
  • seamonkey RHEL 3 1.0.9-0.62.el3
  • seamonkey RHEL 4 1.0.9-65.el4_8
  • seamonkey-nss RHEL 3 1.0.9-0.62.el3

red hat advisories RHSA-2010:0896RHSA-2010:0861RHSA-2010:0812RHSA-2010:0810RHSA-2010:0809RHSA-2010:0808

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2010-3765 updated cvss 6.8

Firefox race condition flaw (MFSA 2010-73)

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.62.el3, seamonkey-nss 1.0.9-0.62.el3, seamonkey-chat 1.0.9-0.62.el3, seamonkey-mail 1.0.9-0.62.el3, seamonkey-nspr 1.0.9-0.62.el3, seamonkey-js-debugger 1.0.9-0.62.el3, +1 more
    fixed: vendor fix RHSA-2010:0810
  • Red Hat Enterprise Linux (v. 5 server) xulrunner 1.9.2.11-4.el5_5
    fixed: vendor fix RHSA-2010:0809
  • Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.62.el3, seamonkey-nss 1.0.9-0.62.el3, seamonkey-chat 1.0.9-0.62.el3, seamonkey-mail 1.0.9-0.62.el3, seamonkey-nspr 1.0.9-0.62.el3, seamonkey-js-debugger 1.0.9-0.62.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.6.11-4.el4_8, seamonkey 1.0.9-65.el4_8, thunderbird 1.5.0.12-33.el4, seamonkey-chat 1.0.9-65.el4_8, seamonkey-mail 1.0.9-65.el4_8, seamonkey-js-debugger 1.0.9-65.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0810
  • Red Hat Enterprise Linux Desktop (v. 5 client) xulrunner 1.9.2.11-4.el5_5, thunderbird 2.0.0.24-10.el5_5
    fixed: vendor fix RHSA-2010:0812
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 3.6.12-1.el6_0, thunderbird 3.1.6-1.el6_0, xulrunner 1.9.2.12-1.el6_0 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 1.9.2.12-1.el6_0
    fixed: vendor fix RHSA-2010:0861
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.6.11-4.el4_8, seamonkey 1.0.9-65.el4_8, thunderbird 1.5.0.12-33.el4, seamonkey-chat 1.0.9-65.el4_8, seamonkey-mail 1.0.9-65.el4_8, seamonkey-js-debugger 1.0.9-65.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0810
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.2.11-4.el5_5
    fixed: vendor fix RHSA-2010:0809
  • Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.62.el3, seamonkey-nss 1.0.9-0.62.el3, seamonkey-chat 1.0.9-0.62.el3, seamonkey-mail 1.0.9-0.62.el3, seamonkey-nspr 1.0.9-0.62.el3, seamonkey-js-debugger 1.0.9-0.62.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.6.11-4.el4_8, seamonkey 1.0.9-65.el4_8, thunderbird 1.5.0.12-33.el4, seamonkey-chat 1.0.9-65.el4_8, seamonkey-mail 1.0.9-65.el4_8, seamonkey-js-debugger 1.0.9-65.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0810
show 4 more
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 3.6.12-1.el6_0, xulrunner 1.9.2.12-1.el6_0
    fixed: vendor fix RHSA-2010:0861
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.24-10.el5_5
    fixed: vendor fix RHSA-2010:0812
  • Red Hat Enterprise Linux Server (v. 6) firefox 3.6.12-1.el6_0, xulrunner 1.9.2.12-1.el6_0 Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 3.1.6-1.el6_0, xulrunner 1.9.2.12-1.el6_0 Red Hat Enterprise Linux Workstation (v. 6) firefox 3.6.12-1.el6_0, thunderbird 3.1.6-1.el6_0, xulrunner 1.9.2.12-1.el6_0 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 1.9.2.12-1.el6_0
    fixed: vendor fix RHSA-2010:0861
  • Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.62.el3, seamonkey-nss 1.0.9-0.62.el3, seamonkey-chat 1.0.9-0.62.el3, seamonkey-mail 1.0.9-0.62.el3, seamonkey-nspr 1.0.9-0.62.el3, seamonkey-js-debugger 1.0.9-0.62.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.6.11-4.el4_8, seamonkey 1.0.9-65.el4_8, thunderbird 1.5.0.12-33.el4, seamonkey-chat 1.0.9-65.el4_8, seamonkey-mail 1.0.9-65.el4_8, seamonkey-js-debugger 1.0.9-65.el4_8, +1 more
    fixed: vendor fix RHSA-2010:0810

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/windows/browser/mozilla_interleaved_write)
  2. Published
  3. CISA SSVC: exploitation active
  4. Added to CISA KEV
  5. CISA patch deadline

Known exploited

Added
13 mo ago
Patch by
2025-10-27 (12 mo ago)
Ransomware
Not known
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.
Vendor, product
Mozilla, Multiple Products
CISA name
Mozilla Multiple Products Remote Code Execution Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
13 mo ago

Exploit prediction

83.16% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/windows/browser/mozilla_interleaved_write Mozilla Firefox Interleaved document.write/appendChild Memory Corruption metasploit exploit, normal rank, 2010-10-25
  • EDB-16509 Mozilla Firefox - Interleaving 'document.write' / 'appendChild' (Metasploit) remote, 2011-02-22
  • EDB-15352 Mozilla Firefox 3.6.8 < 3.6.11 - Interleaving 'document.write' / 'appendChild' Remote Overflow remote, 2010-10-29
  • EDB-15342 Mozilla Firefox - Simplified Memory Corruption (PoC) dos, 2010-10-28
  • EDB-15341 Mozilla Firefox - Interleaving 'document.write' / 'appendChild' Denial of Service dos, 2010-10-28

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.