Critical severity · published Oct 27, 2010
CVE-2010-3765
Mozilla Multiple Products Remote Code Execution Vulnerability
In wildKEV
9.8
CVSS
83.2%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)83.2% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Oct 6, 2025
Federal remediation dueOct 27, 2025
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
3.5; 3.5.1; 3.5.2; 3.5.3; 3.5.4; 3.5.5; +19 more · source: NVD
SE
Seamonkey · Mozilla
2.0; 2.0; 2.0; 2.0; 2.0; 2.0; +11 more · source: NVD
TH
Thunderbird · Mozilla
3.0.1; 3.0.2; 3.0.3; 3.0.4; 3.0.5; 3.0.6; +8 more · source: NVD
MP
Multiple Products · Mozilla
All versions, or not specified · source: KEV
In the news
VulnerabilityHigh
[CISA KEV] CVE-2010-3765: Mozilla Multiple Products - Mozilla Multiple Products Remote Code Execution Vulnerability
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.
MPMultiple ProductsCVE-2010-3765
Oct 6, 2025·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2010-3765
CVE.org
https://www.cve.org/CVERecord?id=CVE-2010-3765
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Vendor Advisory
http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/
Broken Link
http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox
Press/Media Coverage
http://isc.sans.edu/diary.html?storyid=9817
Third Party Advisory
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
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