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CVE record · CVE-2026-77501

Windows DHCP Server Denial of Service Vulnerability

CVSS 7.5 HighEPSS 0.012 · 67th percentile

Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 10 Version 1607
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2012
  • affected 6.2.9200.0 to before 6.2.9200.26349 custom
Microsoft Windows Server 2012 (Server Core installation)
  • affected 6.2.9200.0 to before 6.2.9200.26349 custom
Microsoft Windows Server 2012 R2
  • affected 6.3.9600.0 to before 6.3.9600.23398 custom
Microsoft Windows Server 2012 R2 (Server Core installation)
  • affected 6.3.9600.0 to before 6.3.9600.23398 custom
Microsoft Windows Server 2016
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2016 (Server Core installation)
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.5622 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33438 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33438 custom
Identifiers
CVE-2026-77501
CNA
microsoft
Weakness (CWE)
CWE-125
Tags
Published
8 Sept 2026
Updated
10 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Windows DHCP Server on Windows 10 Version 1607 and 1809, Windows Server 2012, 2012 R2, 2016 and 2019 (including Server Core installations) is affected, with versions before the fixed builds listed for each product. An unauthenticated attacker on the network can trigger an out-of-bounds read to cause a denial of service. Upgrade to the fixed version for your product: 10.0.14393.9512, 10.0.17763.9245, 6.2.9200.26349, or 6.3.9600.23398.

Written 11 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.012, the 67th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 8 Sept 2026, 17:13 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 16:21 UTC First seen by agentprime

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.