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CVE-2010-3765: Mozilla Multiple Products Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2010-3765
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as 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.

CSIRTS triage

vendor: Mozillaproduct: Firefox, SeaMonkey, ThunderbirdRemote code execution
What
The vulnerability allows remote attackers to execute arbitrary code when JavaScript is enabled.
Who is affected
Users of Mozilla Firefox, SeaMonkey, and Thunderbird with JavaScript enabled.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and rated critical.
Action
Update to the latest versions of Firefox, SeaMonkey, and Thunderbird.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-10-06
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2010-3765

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2010-3765coverage & exploitation statusNVD · CVE.org

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