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CVE-2026-68820CISA KEV

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEVCheck MSRC

CISA catalog record

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

Product
Windows Ancillary Function Driver for WinSock
Added to KEV
11 Aug 2026
Federal remediation due
25 Aug 2026
Known ransomware use
Not reported

What changed

  1. CISA KEV: Listed 11 Aug 2026; remediation due 25 Aug 2026 → Listed 11 Aug 2026 · Title changed
  2. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  3. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  4. Detection template: No Nuclei template listed · Customer action: Required: apply the update → Required: follow the MSRC remediation guidance · Public disclosure: No → No (MSRC assessment) · Exploitation detected: Yes → Yes, reported by MSRC
  5. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  6. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (69)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 4 Nov 2026 · 21:21:22 UTC Federal remediation due25 Aug 2026
  2. 4 Nov 2026 · 21:21:22 UTC Known ransomware useNot stated
  3. 4 Nov 2026 · 21:21:22 UTC CISA KEVListed 11 Aug 2026; remediation due 25 Aug 2026 → Listed 11 Aug 2026
  4. 4 Nov 2026 · 21:21:22 UTC ProductWindows Ancillary Function Driver for WinSock
  5. 4 Nov 2026 · 21:21:22 UTC VendorMicrosoft
  6. 4 Nov 2026 · 21:21:22 UTC Source coverage: public-exploit-codeCurrent → Not collected
  7. 4 Nov 2026 · 21:21:22 UTC Source coverage: first-epssCurrent → Not collected
  8. 4 Nov 2026 · 21:21:22 UTC Source coverage: msrc-cvrfCurrent → Not collected
  9. 4 Nov 2026 · 21:21:22 UTC Link: KB5121003/windows/kb/KB5121003 → No longer listed in this observation
  10. 4 Nov 2026 · 21:21:22 UTC Link: KB5121000/windows/kb/KB5121000 → No longer listed in this observation
  11. 4 Nov 2026 · 21:21:22 UTC Link: KB5120994/windows/kb/KB5120994 → No longer listed in this observation
  12. 4 Nov 2026 · 21:21:22 UTC Link: KB5120418/windows/kb/KB5120418 → No longer listed in this observation
  13. 4 Nov 2026 · 21:21:22 UTC Link: KB5120386/windows/kb/KB5120386 → No longer listed in this observation
  14. 4 Nov 2026 · 21:21:22 UTC Link: KB5120385/windows/kb/KB5120385 → No longer listed in this observation
  15. 4 Nov 2026 · 21:21:22 UTC Link: KB5120249/windows/kb/KB5120249 → No longer listed in this observation
  16. 4 Nov 2026 · 21:21:22 UTC Link: KB5120242/windows/kb/KB5120242 → No longer listed in this observation
  17. 4 Nov 2026 · 21:21:22 UTC Link: KB5120240/windows/kb/KB5120240 → No longer listed in this observation
  18. 4 Nov 2026 · 21:21:22 UTC Link: KB5120238/windows/kb/KB5120238 → No longer listed in this observation
  19. 4 Nov 2026 · 21:21:22 UTC Link: KB5120233/windows/kb/KB5120233 → No longer listed in this observation
  20. 4 Nov 2026 · 21:21:22 UTC Link: KB5120229/windows/kb/KB5120229 → No longer listed in this observation
  21. 4 Nov 2026 · 21:21:22 UTC Link: KB5120228/windows/kb/KB5120228 → No longer listed in this observation
  22. 4 Nov 2026 · 21:21:22 UTC Link: August 2026/security?release=2026-Aug#cves → No longer listed in this observation
  23. 4 Nov 2026 · 21:21:22 UTC SourceMicrosoft Security Response Center → CISA Known Exploited Vulnerabilities
  24. 4 Nov 2026 · 21:21:22 UTC SummaryUse after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. → Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.
  25. 4 Nov 2026 · 21:21:22 UTC TitleWindows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability → Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
  26. 4 Nov 2026 · 03:04:37 UTC EPSS8.6%; scored 2 Nov 2026 → 8.6%; scored 3 Nov 2026
  27. 3 Nov 2026 · 01:53:36 UTC EPSS8.6%; scored 1 Nov 2026 → 8.6%; scored 2 Nov 2026
  28. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  29. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  30. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  31. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  32. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  33. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  34. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  35. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  36. 2 Nov 2026 · 00:36:51 UTC EPSS8.6%; scored 31 Oct 2026 → 8.6%; scored 1 Nov 2026
  37. 31 Oct 2026 · 18:22:15 UTC EPSS8.6%; scored 30 Oct 2026 → 8.6%; scored 31 Oct 2026
  38. 30 Oct 2026 · 18:02:45 UTC EPSS0.3%; scored 29 Oct 2026 → 8.6%; scored 30 Oct 2026
  39. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  40. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  41. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  42. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedYes → Yes, reported by MSRC
  43. 29 Oct 2026 · 18:33:30 UTC EPSS0.3%; scored 28 Oct 2026 → 0.3%; scored 29 Oct 2026
  44. 28 Oct 2026 · 20:00:33 UTC EPSS0.3%; scored 27 Oct 2026 → 0.3%; scored 28 Oct 2026
  45. 27 Oct 2026 · 15:48:13 UTC EPSS0.3%; scored 26 Oct 2026 → 0.3%; scored 27 Oct 2026
  46. 26 Oct 2026 · 23:57:09 UTC EPSS0.3%; scored 25 Oct 2026 → 0.3%; scored 26 Oct 2026
  47. 25 Oct 2026 · 17:12:51 UTC EPSS0.3%; scored 24 Oct 2026 → 0.3%; scored 25 Oct 2026
  48. 25 Oct 2026 · 01:34:18 UTC EPSS0.3%; scored 23 Oct 2026 → 0.3%; scored 24 Oct 2026
  49. 23 Oct 2026 · 15:51:28 UTC EPSS0.3%; scored 22 Oct 2026 → 0.3%; scored 23 Oct 2026
  50. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  51. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  52. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  53. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  54. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  55. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  56. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  57. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  58. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  59. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  60. 22 Oct 2026 · 17:33:15 UTC EPSS0.3%; scored 21 Oct 2026 → 0.3%; scored 22 Oct 2026
  61. 21 Oct 2026 · 21:47:24 UTC EPSS0.3%; scored 20 Oct 2026 → 0.3%; scored 21 Oct 2026
  62. 20 Oct 2026 · 20:53:31 UTC EPSS0.3%; scored 19 Oct 2026 → 0.3%; scored 20 Oct 2026
  63. 19 Oct 2026 · 15:12:40 UTC EPSS0.3%; scored 18 Oct 2026 → 0.3%; scored 19 Oct 2026
  64. 18 Oct 2026 · 14:54:30 UTC EPSS0.3%; scored 16 Oct 2026 → 0.3%; scored 18 Oct 2026
  65. 18 Oct 2026 · 14:54:30 UTC Link: August 2026/security?release=2026-Aug#cves
  66. 16 Oct 2026 · 16:13:25 UTC EPSS0.3%; scored 15 Oct 2026 → 0.3%; scored 16 Oct 2026
  67. 15 Oct 2026 · 21:30:54 UTC EPSS0.3%; scored 14 Oct 2026 → 0.3%; scored 15 Oct 2026
  68. 15 Oct 2026 · 01:07:54 UTC EPSS0.3%; scored 13 Oct 2026 → 0.3%; scored 14 Oct 2026
  69. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-68820. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-68820

CISA KEV listing collected · added 11 Aug 2026 · Microsoft · Windows Ancillary Function Driver for WinSock

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

CISA source

EPSS unknown / outside the collected prediction scope.

Observed 23 Oct 2026 16:01:26 UTC · Complete immutable risk JSON

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

CVE-2026-68820 · 23 Oct 2026 16:01:26 UTC

Immutable source observations

4 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

10 Nov 2026 23:21:22 UTC

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

cve-program · CVE-2026-68820 · Published

30 Oct 2026 18:45:26 UTC

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

cve-program · CVE-2026-68820 · Published

28 Oct 2026 21:55:13 UTC

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

cve-program · CVE-2026-68820 · Published

23 Oct 2026 15:48:27 UTC

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

cve-program · CVE-2026-68820 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 15:16 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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