CVE-2010-3765
Actively exploited. CVE-2010-3765 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-10-06) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2010-3765 is indexed in Metasploit and Exploit-DB. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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
- 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.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2010-3765 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2010-3765: Mozilla Multiple Products Remote Code Execution Vulnerabilitycisa-kev · 2025-10-06
External references
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[](https://www.csirts.com/cve/CVE-2010-3765)