KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2010-3765

Firefox

Mozilla / Firefox

View live feed Monitor via API Watch CVE
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
83.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2010-3765 is an unauthenticated vulnerability affecting Mozilla Firefox and 2 other products. 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,...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Mozilla / Firefox.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Firefox

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.

View vendor advisory (opens in new tab)
Published
27 Oct 2010
Exploitation Reported
27 Oct 2010
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

java cisa metasploit

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2010-3765
  • RHSA-2010:0812 rhn.redhat.com · Vendor Advisory https://rhn.redhat.com/errata/RHSA-2010-0812.html
  • RHSA-2010:0896 redhat.com · Vendor Advisory http://www.redhat.com/support/errata/RHSA-2010-0896.html
  • RHSA-2010:0808 redhat.com · Vendor Advisory http://www.redhat.com/support/errata/RHSA-2010-0808.html
  • FEDORA-2010-17105 lists.fedoraproject.org · Vendor Advisory http://lists.fedoraproject.org/pipermail/package-announce/2010-Novemb...
  • USN-1011-3 ubuntu.com · Vendor Advisory http://www.ubuntu.com/usn/USN-1011-3
  • USN-1011-1 ubuntu.com · Vendor Advisory http://www.ubuntu.com/usn/usn-1011-1
  • USN-1011-2 ubuntu.com · Vendor Advisory http://www.ubuntu.com/usn/USN-1011-2
  • RHSA-2010:0809 redhat.com · Vendor Advisory http://www.redhat.com/support/errata/RHSA-2010-0809.html
  • MDVSA-2010:219 mandriva.com · Vendor Advisory http://www.mandriva.com/security/advisories?name=MDVSA-2010:219
  • DSA-2124 debian.org · Vendor Advisory http://www.debian.org/security/2010/dsa-2124
  • MDVSA-2010:213 mandriva.com · Vendor Advisory http://www.mandriva.com/security/advisories?name=MDVSA-2010:213
  • FEDORA-2010-16883 lists.fedoraproject.org · Vendor Advisory http://lists.fedoraproject.org/pipermail/package-announce/2010-Octobe...
  • SSA:2010-305-01 slackware.com · Vendor Advisory http://slackware.com/security/viewer.php?l=slackware-security&y=2010&...
  • RHSA-2010:0810 redhat.com · Vendor Advisory http://www.redhat.com/support/errata/RHSA-2010-0810.html
  • FEDORA-2010-16897 lists.fedoraproject.org · Vendor Advisory http://lists.fedoraproject.org/pipermail/package-announce/2010-Octobe...
  • RHSA-2010:0861 redhat.com · Vendor Advisory http://www.redhat.com/support/errata/RHSA-2010-0861.html
  • FEDORA-2010-16885 lists.fedoraproject.org · Vendor Advisory http://lists.fedoraproject.org/pipermail/package-announce/2010-Octobe...
  • 41965 secunia.com · Third-Party Advisory http://secunia.com/advisories/41965
  • 41975 secunia.com · Third-Party Advisory http://secunia.com/advisories/41975
  • 41761 secunia.com · Third-Party Advisory http://secunia.com/advisories/41761
  • 41969 secunia.com · Third-Party Advisory http://secunia.com/advisories/41969
  • 42867 secunia.com · Third-Party Advisory http://secunia.com/advisories/42867
  • 42043 secunia.com · Third-Party Advisory http://secunia.com/advisories/42043
  • 41966 secunia.com · Third-Party Advisory http://secunia.com/advisories/41966
  • 42008 secunia.com · Third-Party Advisory http://secunia.com/advisories/42008
  • 42003 secunia.com · Third-Party Advisory http://secunia.com/advisories/42003
  • 15341 exploit-db.com · Exploit http://www.exploit-db.com/exploits/15341
  • 15352 exploit-db.com · Exploit http://www.exploit-db.com/exploits/15352
  • 15342 exploit-db.com · Exploit http://www.exploit-db.com/exploits/15342
  • 44425 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/44425
  • ADV-2010-2837 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2010/2837
  • 1024651 securitytracker.com · VDB Entry http://www.securitytracker.com/id?1024651
  • 1024650 securitytracker.com · VDB Entry http://www.securitytracker.com/id?1024650
  • ADV-2010-2857 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2010/2857
  • ADV-2011-0061 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2011/0061
  • 1024645 securitytracker.com · VDB Entry http://www.securitytracker.com/id?1024645
  • ADV-2010-2871 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2010/2871
  • oval:org.mitre.oval:def:12108 oval.cisecurity.org · VDB Entry https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.m...
  • ADV-2010-2864 vupen.com · VDB Entry http://www.vupen.com/english/advisories/2010/2864
  • bugzilla.mozilla.org/show_bug.cgi bugzilla.mozilla.org · CVE Record https://bugzilla.mozilla.org/show_bug.cgi?id=607222#c53
  • bugzilla.redhat.com/show_bug.cgi bugzilla.redhat.com · CVE Record https://bugzilla.redhat.com/show_bug.cgi?id=646997
  • support.avaya.com/css/P8/documents/100114335 support.avaya.com · CVE Record http://support.avaya.com/css/P8/documents/100114335
  • bugzilla.mozilla.org/show_bug.cgi bugzilla.mozilla.org · CVE Record https://bugzilla.mozilla.org/show_bug.cgi?id=607222
  • norman.com/about_norman/press_center/news_archive/2010/... norman.com · CVE Record http://norman.com/about_norman/press_center/news_archive/2010/129223/...
  • blogs.sun.com/security/entry/multiple_vulnerabilities_in_m... blogs.sun.com · CVE Record http://blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozil...
  • norman.com/about_norman/press_center/news_archive/2010/... norman.com · CVE Record http://www.norman.com/about_norman/press_center/news_archive/2010/129...
  • blog.mozilla.com/security/2010/10/26/critical-vulnerability-i... blog.mozilla.com · CVE Record http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in...
  • support.avaya.com/css/P8/documents/100114329 support.avaya.com · CVE Record http://support.avaya.com/css/P8/documents/100114329
  • norman.com/security_center/virus_description_archive/12... norman.com · CVE Record http://www.norman.com/security_center/virus_description_archive/129146/
  • isc.sans.edu/diary.html isc.sans.edu · CVE Record http://isc.sans.edu/diary.html?storyid=9817
  • mozilla.org/security/announce/2010/mfsa2010-73.html mozilla.org · CVE Record http://www.mozilla.org/security/announce/2010/mfsa2010-73.html

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 27 Oct 2010

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

Recorded 28 Apr 2025

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2010-10-27 22:00 UTC
CISA 2026-06-02 14:05 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/browser/mozilla_interleaved_write.rb 28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

83.3%

Weaknesses

Improper Restriction of Operations within the Bounds of a Memory Buffer CWE-119

All CVSS Scores

CVSS v3.1 9.8 Critical

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

CVSS v2.0 9.3 High

AV:N/AC:M/Au:N/C:C/I:C/A:C

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

mozilla_interleaved_write

metasploit · Created Unknown

Metasploit module for CVE-2010-3765

Timeline

From disclosure to observed exploitation

  1. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. Metasploit module available

    Exploit module available

  3. Public PoC available

    Public proof-of-concept code published

  4. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  5. CVE published

    Vulnerability disclosed publicly

  6. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2010-3765

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2010-3765",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.83279,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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