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CVE-2026-69781ImportantFix has a known issueDoSAdjacent

Windows DHCP Client Denial of Service Vulnerability

MSRC advisory NVD CVE.org

Assessment

Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over an adjacent network.

Severity
Important
CVSS base score
6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Impact
Denial of Service
EPSS · 30-day forecast
0.6%FIRST forecast dated 9 Nov 2026, for the following 30 days · FIRST percentile 48.1% · about EPSS
Public detection template
No Nuclei template is listed in the current collected catalog
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Unlikely
Publicly disclosed
No (MSRC assessment)
Customer action
Required: follow the MSRC remediation guidance
Component
Windows DHCP Client
Weakness
CWE-401: Missing Release of Memory after Effective Lifetime
Issued by
Microsoft
Published
8 Sep 2026 · September 2026
Last revised
8 Sep 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
AdjacentAV:A
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

3 KBs
KBTypeRestartApplies toKnown issuesOther CVEs
KB5122871 Security UpdateRequiredWindows Server 2025, Windows Server 2025 (Server Core installation)MitigatedUSB audio devices might fail to start or produce no soundAll CVEs in KB5122871
KB5124008 Security UpdateRequiredWindows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 moreMitigatedUSB audio devices might fail to start or produce no soundResolvedDomain-joined devices might lose their secure trust relationship with the domainAll CVEs in KB5124008
KB5124012 Security UpdateRequiredWindows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based SystemsMitigatedUSB audio devices might fail to start or produce no soundResolvedDomain-joined devices might lose their secure trust relationship with the domainAll CVEs in KB5124012

Affected products

Windows
8 affected products

What changed

  1. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  3. Fixes: No KB listed → KB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required) · Affected products: → Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2025, Windows Server 2025 (Server Core installation) · Impact: Not stated → Denial of Service · CVSS vector: Not published → CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C · CVSS score: Not published → 6.5 · Severity: Unrated → Important
  4. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  5. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  6. 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: Not reported by MSRC → No known exploitation (MSRC assessment)
  7. Fixes: KB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required) → No KB listed · Affected products: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2025, Windows Server 2025 (Server Core installation) → · Impact: Denial of Service → Not stated · CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C → Not published · CVSS score: 6.5 → Not published · Severity: Important → Unrated
  8. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  9. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog 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 (72)

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

  1. 9 Nov 2026 · 22:24:37 UTC EPSS0.6%; scored 8 Nov 2026 → 0.6%; scored 9 Nov 2026
  2. 8 Nov 2026 · 15:16:05 UTC EPSS0.6%; scored 7 Nov 2026 → 0.6%; scored 8 Nov 2026
  3. 7 Nov 2026 · 16:12:44 UTC EPSS0.6%; scored 6 Nov 2026 → 0.6%; scored 7 Nov 2026
  4. 6 Nov 2026 · 19:15:37 UTC EPSS0.6%; scored 5 Nov 2026 → 0.6%; scored 6 Nov 2026
  5. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  6. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  7. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  8. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  9. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  10. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  11. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  12. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  13. 5 Nov 2026 · 23:42:03 UTC EPSS0.6%; scored 4 Nov 2026 → 0.6%; scored 5 Nov 2026
  14. 5 Nov 2026 · 02:36:20 UTC EPSS0.6%; scored 3 Nov 2026 → 0.6%; scored 4 Nov 2026
  15. 4 Nov 2026 · 03:04:37 UTC EPSS0.6%; scored 2 Nov 2026 → 0.6%; scored 3 Nov 2026
  16. 3 Nov 2026 · 01:53:36 UTC EPSS0.6%; scored 1 Nov 2026 → 0.6%; scored 2 Nov 2026
  17. 3 Nov 2026 · 01:53:36 UTC Updates that fix itNo KB listed → KB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required)
  18. 3 Nov 2026 · 01:53:36 UTC Affected products → Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2025, Windows Server 2025 (Server Core installation)
  19. 3 Nov 2026 · 01:53:36 UTC ImpactNot stated → Denial of Service
  20. 3 Nov 2026 · 01:53:36 UTC CVSS vectorNot published → CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
  21. 3 Nov 2026 · 01:53:36 UTC CVSS base scoreNot published → 6.5
  22. 3 Nov 2026 · 01:53:36 UTC SeverityUnrated → Important
  23. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  24. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  25. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  26. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  27. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  28. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  29. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  30. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  31. 2 Nov 2026 · 00:36:51 UTC EPSS0.6%; scored 31 Oct 2026 → 0.6%; scored 1 Nov 2026
  32. 31 Oct 2026 · 18:22:15 UTC EPSS0.6%; scored 30 Oct 2026 → 0.6%; scored 31 Oct 2026
  33. 30 Oct 2026 · 18:02:45 UTC EPSS0.6%; scored 29 Oct 2026 → 0.6%; scored 30 Oct 2026
  34. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  35. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  36. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  37. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  38. 29 Oct 2026 · 18:33:30 UTC EPSS0.6%; scored 28 Oct 2026 → 0.6%; scored 29 Oct 2026
  39. 28 Oct 2026 · 20:00:33 UTC EPSS0.6%; scored 27 Oct 2026 → 0.6%; scored 28 Oct 2026
  40. 27 Oct 2026 · 16:51:02 UTC Updates that fix itKB5122871: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5124008: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems (restart required); KB5124012: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required) → No KB listed
  41. 27 Oct 2026 · 16:51:02 UTC Affected productsWindows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2025, Windows Server 2025 (Server Core installation) →
  42. 27 Oct 2026 · 16:51:02 UTC ImpactDenial of Service → Not stated
  43. 27 Oct 2026 · 16:51:02 UTC CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C → Not published
  44. 27 Oct 2026 · 16:51:02 UTC CVSS base score6.5 → Not published
  45. 27 Oct 2026 · 16:51:02 UTC SeverityImportant → Unrated
  46. 27 Oct 2026 · 15:48:13 UTC EPSS0.6%; scored 26 Oct 2026 → 0.6%; scored 27 Oct 2026
  47. 26 Oct 2026 · 23:57:09 UTC EPSS0.6%; scored 25 Oct 2026 → 0.6%; scored 26 Oct 2026
  48. 25 Oct 2026 · 17:12:51 UTC EPSS0.6%; scored 24 Oct 2026 → 0.6%; scored 25 Oct 2026
  49. 25 Oct 2026 · 01:34:18 UTC EPSS0.6%; scored 23 Oct 2026 → 0.6%; scored 24 Oct 2026
  50. 23 Oct 2026 · 15:51:28 UTC EPSS0.6%; scored 22 Oct 2026 → 0.6%; scored 23 Oct 2026
  51. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  52. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  53. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  54. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  55. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  56. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  57. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  58. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  59. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  60. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  61. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  62. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  63. 22 Oct 2026 · 17:33:15 UTC EPSS0.6%; scored 21 Oct 2026 → 0.6%; scored 22 Oct 2026
  64. 21 Oct 2026 · 21:47:24 UTC EPSS0.6%; scored 20 Oct 2026 → 0.6%; scored 21 Oct 2026
  65. 20 Oct 2026 · 20:53:31 UTC EPSS0.6%; scored 19 Oct 2026 → 0.6%; scored 20 Oct 2026
  66. 19 Oct 2026 · 15:12:40 UTC EPSS0.6%; scored 18 Oct 2026 → 0.6%; scored 19 Oct 2026
  67. 18 Oct 2026 · 14:54:30 UTC EPSS0.6%; scored 16 Oct 2026 → 0.6%; scored 18 Oct 2026
  68. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  69. 16 Oct 2026 · 16:13:25 UTC EPSS0.6%; scored 15 Oct 2026 → 0.6%; scored 16 Oct 2026
  70. 15 Oct 2026 · 21:30:54 UTC EPSS0.6%; scored 14 Oct 2026 → 0.6%; scored 15 Oct 2026
  71. 15 Oct 2026 · 01:07:54 UTC EPSS0.6%; scored 13 Oct 2026 → 0.6%; scored 14 Oct 2026
  72. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-69781. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-69781

Published

Windows 11 Version 24H2

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Windows 11 Version 24H2",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.9445",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 Version 25H2

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Windows 11 Version 25H2",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26200.0",
                            "lessThan": "10.0.26200.9445",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 version 26H1

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Windows 11 version 26H1",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.28000.0",
                            "lessThan": "10.0.28000.2954",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33438",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025 (Server Core installation)

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33438",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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