CVE-2010-3765

CRITICALNVD 9.89.8
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to NVD's CVSS score.

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 Known Exploited Vulnerabilities catalog, EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 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) — the reason this is sooner than the SSVC decision on this page at low mission impact
CISA-KEV: ExploitedEPSS PROB: 83%CVSS: 9.8Exploit: Metasploit · Exploit-DB (verified)Exposed services: Not assessed

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
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation100% × 40%
Fixed at 100% for a CISA KEV listing: EchelonGraph's rule.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Attend at low mission impact; Act at medium or high.
Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
83%
EPSS %ILE
99th
KEV
⚠ Exploited

SSVC (CISA's decision table, applied by EchelonGraph)Attend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days & forensic triage if the affected system is publicly exposed; 3 days & forensic triage if it is not.

In CISA KEV yes (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

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

Quoted verbatim from CISA's Known Exploited Vulnerabilities catalog. CISA directs it at US federal civilian executive branch agencies under Binding Operational Directive (BOD) 26-04, which replaced BOD 22-01 on 10 June 2026; it is not EchelonGraph's advice. CISA's notes: https://www.mozilla.org/en-US/security/advisories/mfsa2010-73 · https://nvd.nist.gov/vuln/detail/CVE-2010-3765

Published

October 28, 2010

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated Oct 8, 2026
⚠️ Actively exploited (CISA KEV, CISA Vulnrichment). Patch available.
Web page

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/41965
Web page

Firefox news - SANS Internet Storm Center

http://isc.sans.edu/diary.html?storyid=9817
Web page

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/
Web page

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
Web page

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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuxulrunner-1.9.2 (1.9.2.12+build1+nobinonly-0ubuntu0.9.10.1) @ karmic2026-10-12ubuntu
ubuntufirefox (3.6.12+build1+nobinonly-0ubuntu0.10.10.1) @ maverick2026-10-12ubuntu
ubuntuthunderbird (3.1.6+build1+nobinonly-0ubuntu0.10.10.1) @ maverick2026-10-12ubuntu
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
redhatfirefox-0:3.6.11-4.el4_82010-10-27redhat
redhatseamonkey-0:1.0.9-65.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 rangeFix by version rangeDependents
xulrunner1.9.0.10-1 ... 1.9.0.9-1 (25 versions)
  • every version up to 1.9.0.19-6: fixed in 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 101× in last 7d / 430× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 1,911 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 1,811 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 06:23 UTCVendor advisory
  2. 2026-10-12 06:22 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  3. 2026-10-12 02:40 UTCVendor advisory
  4. 2026-10-12 02:40 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  5. 2026-10-11 23:00 UTCVendor advisory
  6. 2026-10-11 23:00 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  7. 2026-10-11 19:20 UTCEG score recompute
  8. 2026-10-11 19:20 UTCVendor advisory
  9. 2026-10-11 19:20 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  10. 2026-10-11 15:40 UTCEG score recompute
  11. 2026-10-11 15:40 UTCVendor advisory
  12. 2026-10-11 15:40 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  13. 2026-10-11 12:01 UTCEG score recompute
  14. 2026-10-11 12:01 UTCVendor advisory
  15. 2026-10-11 12:00 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  16. 2026-10-11 08:21 UTCVendor advisory
  17. 2026-10-11 08:21 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  18. 2026-10-11 04:41 UTCVendor advisory
  19. 2026-10-11 04:40 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  20. 2026-10-11 01:00 UTCVendor advisory
  21. 2026-10-11 00:59 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  22. 2026-10-10 21:18 UTCVendor advisory
  23. 2026-10-10 21:18 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  24. 2026-10-10 17:36 UTCVendor advisory
  25. 2026-10-10 17:35 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-10 13:56 UTCVendor advisory
  2. 2026-10-10 13:56 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  3. 2026-10-10 10:16 UTCVendor advisory
  4. 2026-10-10 10:16 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  5. 2026-10-10 06:36 UTCVendor advisory
  6. 2026-10-10 06:35 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  7. 2026-10-10 02:56 UTCVendor advisory
  8. 2026-10-10 02:56 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  9. 2026-10-09 23:16 UTCEG score recompute
  10. 2026-10-09 23:16 UTCVendor advisory
  11. 2026-10-09 23:16 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  12. 2026-10-09 20:00 UTCEPSS rescoreEPSS 83% · 99th percentile
  13. 2026-10-09 19:35 UTCVendor advisory
  14. 2026-10-09 19:35 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  15. 2026-10-09 15:55 UTCVendor advisory
  16. 2026-10-09 15:55 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  17. 2026-10-09 12:15 UTCVendor advisory
  18. 2026-10-09 12:15 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  19. 2026-10-09 08:33 UTCVendor advisory
  20. 2026-10-09 08:33 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  21. 2026-10-09 04:52 UTCVendor advisory
  22. 2026-10-09 04:51 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  23. 2026-10-09 01:12 UTCVendor advisory
  24. 2026-10-09 01:12 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  25. 2026-10-08 21:33 UTCVendor advisory
  26. 2026-10-08 21:33 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  27. 2026-10-08 17:52 UTCVendor advisory
  28. 2026-10-08 17:52 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  29. 2026-10-08 14:12 UTCVendor advisory
  30. 2026-10-08 14:12 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  31. 2026-10-08 10:28 UTCVendor advisory
  32. 2026-10-08 10:28 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  33. 2026-10-08 06:48 UTCVendor advisory
  34. 2026-10-08 06:48 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  35. 2026-10-08 03:08 UTCVendor advisory
  36. 2026-10-08 03:08 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  37. 2026-10-07 23:28 UTCVendor advisory
  38. 2026-10-07 23:28 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  39. 2026-10-07 19:49 UTCVendor advisory
  40. 2026-10-07 19:49 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  41. 2026-10-07 16:09 UTCVendor advisory
  42. 2026-10-07 16:09 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  43. 2026-10-07 12:28 UTCVendor advisory
  44. 2026-10-07 12:28 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  45. 2026-10-07 08:49 UTCVendor advisory
  46. 2026-10-07 08:49 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  47. 2026-10-07 05:09 UTCVendor advisory
  48. 2026-10-07 05:09 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  49. 2026-10-07 01:29 UTCVendor advisory
  50. 2026-10-07 01:29 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  51. 2026-10-06 21:49 UTCVendor advisory
  52. 2026-10-06 21:49 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  53. 2026-10-06 18:09 UTCEG score recompute
  54. 2026-10-06 18:09 UTCVendor advisory
  55. 2026-10-06 18:09 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  56. 2026-10-06 15:09 UTCEPSS rescoreEPSS 83% · 99th percentile
  57. 2026-10-06 14:30 UTCVendor advisory
  58. 2026-10-06 14:30 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  59. 2026-10-06 10:50 UTCVendor advisory
  60. 2026-10-06 10:50 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  61. 2026-10-06 07:11 UTCVendor advisory
  62. 2026-10-06 07:11 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  63. 2026-10-06 03:31 UTCVendor advisory
  64. 2026-10-06 03:31 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  65. 2026-10-06 03:31 UTCVendor advisory
  66. 2026-10-06 03:30 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  67. 2026-10-05 23:51 UTCVendor advisory
  68. 2026-10-05 23:51 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  69. 2026-10-05 20:11 UTCVendor advisory
  70. 2026-10-05 20:10 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  71. 2026-10-05 16:30 UTCVendor advisory
  72. 2026-10-05 16:30 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  73. 2026-10-05 12:51 UTCVendor advisory
  74. 2026-10-05 12:51 UTCGHSA enrichmentGHSA-cmrc-q43h-xrrq · GitHub severity HIGH · GitHub CVSS 9.8
  75. 2026-10-05 09:11 UTCVendor advisory

Publicly available exploits

(5 references)

Public exploit code is referenced for this CVE (1 Metasploit module, 4 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-16509✓ verified
    Published Feb 22, 2011

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

    Open source ↗
  • Metasploitexploit/windows/browser/mozilla_interleaved_write✓ verified
    Published Feb 18, 2011

    Mozilla Firefox Interleaved document.write/appendChild Memory Corruption

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

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

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

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

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

    Mozilla Firefox - Simplified Memory Corruption (PoC)

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(6)

What is CVE-2010-3765?
CVE-2010-3765 is a critical-severity vulnerability; its CVE record was 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 made public?
CVE-2010-3765 was made public on October 26, 2010: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on October 28, 2010. EchelonGraph's copy of the record carries a last-modified date of April 22, 2026; the record at its source may have been updated since.
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 attention. A fix is available. Apply it.
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 affected packages EchelonGraph has on record, with version ranges, are listed in the Affected Packages section of this page.
How do I remediate CVE-2010-3765?
A fix for CVE-2010-3765 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2010-3765 are linked in the Vendor Advisories panel on this page.

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