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Actively exploited · Published Oct 27, 2010 · Assigned by mitre

CVE-2010-3765

Critical 9.8 Exploited

In plain English

A critical-severity memory corruption in Multiple Products from Mozilla. Attackers are actively exploiting it in the wild (listed by CISA on October 6, 2025). The chance it is exploited in the next 30 days is estimated at 83.2% (higher than 99.7% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)83.2%top 0.3% of all CVEs
Exploited in the wildYesCISA KEV since Oct 6, 2025
Attack tooling1Metasploit

CISA guidance

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Federal agencies must remediate by Oct 27, 2025.

Official 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.

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References