CVE-2016-3309

HIGHNVD 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 21%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS
97.3%
KEV
⚠ Exploited

Published

August 9, 2016

Last Modified

April 22, 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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 64× in last 7d / 365× 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 725 total refreshes for this CVE.

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

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 high 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 in the National Vulnerability Database on August 9, 2016, 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-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 patching attention.
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.
Which products are affected by CVE-2016-3309?
CVE-2016-3309 affects Microsoft Windows. 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-2016-3309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-3309, 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.

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