CVE-2016-3309

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 20%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · public exploitExposed services: Not assessed

A fix is available — apply it.

The kernel-mode drivers in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-3308, CVE-2016-3310, and CVE-2016-3311.

CVSS v3
7.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.
EPSS PROB
20%
EPSS %ILE
97th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

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

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 9, 2016

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated May 19, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-3309
generic🟡 PoC Available

Microsoft Windows 10 RS2 (x64) - 'win32kfull!bFill' Pool Overflow - Windows_x86-64 local Exploit

https://www.exploit-db.com/exploits/42960/
generic

Microsoft Security Bulletin MS16-098 - Important | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-098
generic
http://www.securitytracker.com/id/1036572
generic
http://www.securityfocus.com/bid/92297

Vendor Advisories for CVE-2016-3309(1)

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

Data Freshness Timeline

(refreshed 93× in last 7d / 395× 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 1,647 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

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

  • Exploit-DBEDB-42960
    First seen Oct 6, 2017

    Microsoft Windows 10 RS2 (x64) - 'win32kfull!bFill' Pool Overflow

    Open source ↗
  • GitHub PoCsiberas/CVE-2016-3309_Reloaded
    First seen Oct 6, 2017

    Exploits for the win32kfull!bFill vulnerability on Win10 x64 RS2 using Bitmap or Palette techniques

    Open source ↗

Frequently asked(6)

What is CVE-2016-3309?
CVE-2016-3309 is a critical vulnerability published on August 9, 2016. The kernel-mode drivers in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of…
When was CVE-2016-3309 disclosed?
CVE-2016-3309 was first published on August 9, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-3309 actively exploited?
Yes. CISA added CVE-2016-3309 to the Known Exploited Vulnerabilities catalog on March 15, 2022, affecting Microsoft Windows. 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-2016-3309?
CVE-2016-3309 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2016-3309?
CVE-2016-3309 affects Microsoft Windows.
How do I remediate CVE-2016-3309?
A fix for CVE-2016-3309 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2016-3309 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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