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CVE-2010-3765

CRITICAL
9.8
CVSS Score
Published: October 27, 2010 at 10:00 PM UTC
Updated: June 16, 2026 at 11:23 PM UTC
3 products affected across 1 vendorFirefoxThunderbirdSeamonkey

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 83%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score83.2%

EPSS (Exploit Prediction Scoring System) estimates a 83.2% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

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.
Ransomware Use
Unknown
Added to KEV
Oct 6, 2025
Remediation Due
Oct 27, 2025
365 days overdue
Notes
https://www.mozilla.org/en-US/security/advisories/mfsa2010-73
https://nvd.nist.gov/vuln/detail/CVE-2010-3765

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.

References (52)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/
x_refsource_CONFIRMBroken Link
Source: [email protected]
http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox
x_refsource_MISCPress/Media Coverage
Source: [email protected]
http://isc.sans.edu/diary.html?storyid=9817
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-November/050233.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050061.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.html
Vendor Advisoryx_refsource_FEDORAThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.html
x_refsource_MISCProduct
Source: [email protected]
http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-119

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