CVE-2010-3765

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-10-06), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 83%CVSS: 9.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
83%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

October 28, 2010

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated Aug 26, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/41965
generic

Norman Antivirus & Security Suite | Now Even Better

http://norman.com/about_norman/press_center/news_archive/2010/129223/en?utm_source=twitterfeed&utm_medium=twitter
generic

Firefox news - SANS Internet Storm Center

http://isc.sans.edu/diary.html?storyid=9817
generic🔴 Active Exploitation

Critical vulnerability in Firefox 3.5 and Firefox 3.6 - Mozilla Security Blog

http://blog.mozilla.com/security/2010/10/26/critical-vulnerability-in-firefox-3-5-and-firefox-3-6/
generic

About Secunia Research | Flexera

http://secunia.com/advisories/41761

Vendor Advisories for CVE-2010-3765(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (3.6.12+build1+nobinonly-0ubuntu0.10.04.1) @ lucid2026-08-27ubuntu
ubuntuthunderbird (2.0.0.24+build1+nobinonly-0ubuntu0.9.10.3) @ karmic2026-08-27ubuntu
ubuntuxulrunner-1.9.2 (1.9.2.12+build1+nobinonly-0ubuntu0.10.10.1) @ maverick2026-08-27ubuntu
redhatthunderbird-0:3.1.6-1.el6_02010-11-17redhat
redhatxulrunner-0:1.9.2.12-1.el6_02010-11-10redhat
redhatthunderbird-0:2.0.0.24-10.el5_52010-10-29redhat
redhatseamonkey-0:1.0.9-65.el4_82010-10-27redhat
redhatfirefox-0:3.6.11-4.el4_82010-10-27redhat
redhatxulrunner-0:1.9.2.11-4.el5_52010-10-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Debian:5.0(1)
PackageVulnerable rangeFixed inDependents
xulrunner1.9.0.10-1 ... 1.9.0.9-1 (25 versions)1.9.0.19-6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(7)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 104× in last 7d / 429× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,264 total refreshes for this CVE.

  1. 2026-08-28 03:13 UTCVendor advisory
  2. 2026-08-28 03:12 UTCGHSA enrichment
  3. 2026-08-27 23:31 UTCVendor advisory
  4. 2026-08-27 23:31 UTCGHSA enrichment
  5. 2026-08-27 19:51 UTCVendor advisory
  6. 2026-08-27 19:51 UTCGHSA enrichment
  7. 2026-08-27 17:22 UTCCISA KEV update
  8. 2026-08-27 16:12 UTCEG score recompute
  9. 2026-08-27 16:12 UTCVendor advisory
  10. 2026-08-27 16:11 UTCGHSA enrichment
  11. 2026-08-27 12:31 UTCVendor advisory
  12. 2026-08-27 12:31 UTCGHSA enrichment
  13. 2026-08-27 08:52 UTCVendor advisory
  14. 2026-08-27 08:52 UTCGHSA enrichment
  15. 2026-08-27 05:11 UTCVendor advisory
  16. 2026-08-27 05:11 UTCGHSA enrichment
  17. 2026-08-27 01:31 UTCVendor advisory
  18. 2026-08-27 01:31 UTCGHSA enrichment
  19. 2026-08-26 21:52 UTCVendor advisory
  20. 2026-08-26 21:52 UTCGHSA enrichment
  21. 2026-08-26 18:08 UTCEG score recompute
  22. 2026-08-26 18:08 UTCVendor advisory
  23. 2026-08-26 18:08 UTCGHSA enrichment
  24. 2026-08-26 17:41 UTCCISA KEV update
  25. 2026-08-26 14:40 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:27 UTCVendor advisory
  2. 2026-08-26 14:27 UTCGHSA enrichment
  3. 2026-08-26 10:48 UTCVendor advisory
  4. 2026-08-26 10:47 UTCGHSA enrichment
  5. 2026-08-26 07:08 UTCVendor advisory
  6. 2026-08-26 07:08 UTCGHSA enrichment
  7. 2026-08-26 03:27 UTCVendor advisory
  8. 2026-08-26 03:27 UTCGHSA enrichment
  9. 2026-08-25 23:47 UTCVendor advisory
  10. 2026-08-25 23:47 UTCGHSA enrichment
  11. 2026-08-25 20:08 UTCVendor advisory
  12. 2026-08-25 20:08 UTCGHSA enrichment
  13. 2026-08-25 16:28 UTCEG score recompute
  14. 2026-08-25 16:28 UTCVendor advisory
  15. 2026-08-25 16:28 UTCGHSA enrichment
  16. 2026-08-25 13:43 UTCEPSS rescore
  17. 2026-08-25 12:49 UTCVendor advisory
  18. 2026-08-25 12:49 UTCGHSA enrichment
  19. 2026-08-25 09:09 UTCVendor advisory
  20. 2026-08-25 09:09 UTCGHSA enrichment
  21. 2026-08-25 05:29 UTCVendor advisory
  22. 2026-08-25 05:29 UTCGHSA enrichment
  23. 2026-08-25 01:49 UTCVendor advisory
  24. 2026-08-25 01:49 UTCGHSA enrichment
  25. 2026-08-24 22:10 UTCVendor advisory
  26. 2026-08-24 22:10 UTCGHSA enrichment
  27. 2026-08-24 18:52 UTCCISA KEV update
  28. 2026-08-24 18:31 UTCVendor advisory
  29. 2026-08-24 18:30 UTCGHSA enrichment
  30. 2026-08-24 14:51 UTCEG score recompute
  31. 2026-08-24 14:51 UTCVendor advisory
  32. 2026-08-24 14:50 UTCGHSA enrichment
  33. 2026-08-24 11:11 UTCVendor advisory
  34. 2026-08-24 11:11 UTCGHSA enrichment
  35. 2026-08-24 07:32 UTCEG score recompute
  36. 2026-08-24 07:32 UTCVendor advisory
  37. 2026-08-24 07:31 UTCGHSA enrichment
  38. 2026-08-24 03:52 UTCVendor advisory
  39. 2026-08-24 03:52 UTCGHSA enrichment
  40. 2026-08-24 00:12 UTCVendor advisory
  41. 2026-08-24 00:12 UTCGHSA enrichment
  42. 2026-08-23 20:33 UTCVendor advisory
  43. 2026-08-23 20:33 UTCGHSA enrichment
  44. 2026-08-23 16:53 UTCVendor advisory
  45. 2026-08-23 16:53 UTCGHSA enrichment
  46. 2026-08-23 13:14 UTCVendor advisory
  47. 2026-08-23 13:14 UTCGHSA enrichment
  48. 2026-08-23 09:34 UTCVendor advisory
  49. 2026-08-23 09:34 UTCGHSA enrichment
  50. 2026-08-23 05:53 UTCVendor advisory
  51. 2026-08-23 05:53 UTCGHSA enrichment
  52. 2026-08-23 02:13 UTCVendor advisory
  53. 2026-08-23 02:13 UTCGHSA enrichment
  54. 2026-08-22 22:34 UTCVendor advisory
  55. 2026-08-22 22:34 UTCGHSA enrichment
  56. 2026-08-22 18:54 UTCVendor advisory
  57. 2026-08-22 18:54 UTCGHSA enrichment
  58. 2026-08-22 15:14 UTCVendor advisory
  59. 2026-08-22 15:14 UTCGHSA enrichment
  60. 2026-08-22 11:34 UTCVendor advisory
  61. 2026-08-22 11:34 UTCGHSA enrichment
  62. 2026-08-22 07:54 UTCVendor advisory
  63. 2026-08-22 07:54 UTCGHSA enrichment
  64. 2026-08-22 04:15 UTCVendor advisory
  65. 2026-08-22 04:15 UTCGHSA enrichment
  66. 2026-08-22 00:36 UTCEG score recompute
  67. 2026-08-22 00:36 UTCVendor advisory
  68. 2026-08-22 00:36 UTCGHSA enrichment
  69. 2026-08-21 20:56 UTCVendor advisory
  70. 2026-08-21 20:56 UTCGHSA enrichment
  71. 2026-08-21 17:17 UTCVendor advisory
  72. 2026-08-21 17:17 UTCGHSA enrichment
  73. 2026-08-21 16:49 UTCCISA KEV update
  74. 2026-08-21 13:37 UTCVendor advisory
  75. 2026-08-21 13:37 UTCGHSA enrichment

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (4 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16509✓ verified
    First seen Feb 22, 2011

    Mozilla Firefox - Interleaving 'document.write' / 'appendChild' (Metasploit)

    Open source ↗
  • Exploit-DBEDB-15352✓ verified
    First seen Oct 29, 2010

    Mozilla Firefox 3.6.8 < 3.6.11 - Interleaving 'document.write' / 'appendChild' Remote Overflow

    Open source ↗
  • Exploit-DBEDB-15341✓ verified
    First seen Oct 28, 2010

    Mozilla Firefox - Interleaving 'document.write' / 'appendChild' Denial of Service

    Open source ↗
  • Exploit-DBEDB-15342✓ verified
    First seen Oct 28, 2010

    Mozilla Firefox - Simplified Memory Corruption (PoC)

    Open source ↗
  • Metasploitexploit/windows/browser/mozilla_interleaved_write✓ verified
    First seen Oct 25, 2010

    Mozilla Firefox Interleaved document.write/appendChild Memory Corruption

    Open source ↗

Frequently asked(6)

What is CVE-2010-3765?
CVE-2010-3765 is a critical vulnerability published on October 28, 2010. 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…
When was CVE-2010-3765 disclosed?
CVE-2010-3765 was first published in the National Vulnerability Database on October 28, 2010, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2010-3765 actively exploited?
Yes. CISA added CVE-2010-3765 to the Known Exploited Vulnerabilities catalog on October 6, 2025, affecting Mozilla Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2010-3765?
CVE-2010-3765 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2010-3765?
CVE-2010-3765 affects Mozilla Multiple Products. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2010-3765?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2010-3765, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2010-3765

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