Mozilla Multiple Products Remote Code Execution Vulnerability

Exploited · KEV 2025-10-06Metasploit moduleCVE-2010-3765

Exploited since 2025-10-06. No WAF vendor names it yet.

Edge rules

0/8

Our test

No exploit yet

CVSS

9.8

EPSS

83.2% Top 0.3%

Posts, 14d

Published

2010-10-27

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.

Edge coverage

Claimed by vendors

CloudflareBefore feed historyOlder than its feed AWSBefore feed historyOlder than its feed Microsoft AzureNo public claimNot named Google CloudBefore feed historyOlder than its feed FastlyBefore feed historyOlder than its feed F5Before feed historyOlder than its feed AkamaiNo public sourceNo public changelog OWASP CRSBefore feed historyOlder than its feed

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AI · answers from this page

Ask about CVE-2010-3765: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

Workers AI (Llama 3.3). Can be wrong: check the cited source.

Severity, decoded

CVSS 3.1

9.8Critical

Critical · 9.8 / 10

Exploitable over the network, with no privileges and no user interaction, leading to full loss of confidentiality, integrity and availability.

Over the internetNo login neededNo user actionWorks reliablyFull compromise

How the score is built8 metrics

Attack vectorAn attacker can reach it over the internet; no access to your network needed.
Network
Attack complexityNo special conditions are needed; the attack works reliably.
Low
Privileges requiredNo account or login is needed.
None
User interactionNo one has to click or open anything; the attack works on its own.
None
ScopeThe damage stays within the vulnerable component.
Unchanged
Confidentiality impactAn attacker can read all data the affected component holds, or the most sensitive parts of it.
High
Integrity impactAn attacker can change any data or files the affected component protects.
High
Availability impactAn attacker can take the component down completely or keep it from serving anyone.
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA's assessmentSSVC, from the CVE record

ExploitationActive

Attackers are exploiting this in the wild.

AutomatableYes

Attackers can script the attack end to end and hit many targets at once.

Technical impactTotal

A successful attack gives full control over the affected software or all of its data.

Public exploits

5 found

1 Metasploit4 Exploit-DB0 Scanner template0 GitHub PoCs

MetasploitMozilla Firefox Interleaved document.write/appendChild Memory Corruption2010-10-25 · exploit · rank Normal
Exploit-DBMozilla Firefox - Interleaving 'document.write' / 'appendChild' (Metasploit)2011-02-22 · remote · windows · verified
Exploit-DBMozilla Firefox 3.6.8 < 3.6.11 - Interleaving 'document.write' / 'appendChild' Remote Overflow2010-10-29 · remote · windows · verified
Exploit-DBMozilla Firefox - Interleaving 'document.write' / 'appendChild' Denial of Service2010-10-28 · dos · multiple · verified
Exploit-DBMozilla Firefox - Simplified Memory Corruption (PoC)2010-10-28 · dos · multiple · verified

Links are to third-party code: never run it outside an isolated lab.

Timeline

2010-10-25
Metasploit module published
Mozilla Firefox Interleaved document.write/appendChild Memory Corruption
2010-10-27
CVE published
CVE List
2010-10-28
Exploit published on Exploit-DB
Mozilla Firefox - Interleaving 'document.write' / 'appendChild' Denial of Service
2025-10-06
Added to CISA KEV
Confirmed exploitation in the wild