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Vulnerability record · public intelligence
CVE-2010-3765
CRITICALCISA KEV

CVE-2010-3765

Published Oct 27, 2010 · Updated Nov 3, 2026

Severity · CVSSCRITICAL · Not scored
Known exploitationCISA KEV listed
EPSS / likelihood83.16%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

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.

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

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.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

CISA-KEVFIRST-EPSSCVE-LIST-V5
SSVC priority
IMMEDIATE
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. 44425 ↗
  2. RHSA-2010:0812 ↗
  3. bugzilla.mozilla.org ↗
  4. ADV-2010-2837 ↗
  5. bugzilla.redhat.com ↗
  6. support.avaya.com ↗
  7. 41965 ↗
  8. 41975 ↗
  9. RHSA-2010:0896 ↗
  10. RHSA-2010:0808 ↗
  11. 15341 ↗
  12. 1024651 ↗

Record history

Published Oct 27, 2010 · Last refreshed Nov 3, 2026

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