Risk Letters

Exploited vulnerability

CVE-2010-3765

TLP:CLEAR

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.

Facts

  • Vendor: Mozilla
  • Product: Multiple Products
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 83.2 %
  • On CISA's Known Exploited Vulnerabilities list since: 6 October 2025
  • First known exploitation: 6 October 2025
  • CISA's deadline for US federal agencies: 27 October 2025
  • First seen by Risk Letters: 6 October 2025

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD