CVE-2010-3765

CRITICAL9.8

CISA KEV

Published 2010-10-28 · Updated 2026-06-16 · Source cve@mitre.org

Summary

CVE-2010-3765 is a critical-severity (CVSS 9.8) vulnerability in Mozilla Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalog on October 6, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 27, 2025. CISA does not currently list it as used in ransomware campaigns. Mozilla has 13 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 13 known-exploited Mozilla vulnerabilities →

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

CWE-119CWE-119

CISA Known-Exploited Vulnerability

Product: Mozilla — Multiple Products

Name: Mozilla Multiple Products Remote Code Execution Vulnerability

Date added: 2025-10-06 · Due: 2025-10-27

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.

References

View on NVD

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