CVE-2026-77889 Windows DHCP Server - Denial of Service

Windows DHCP Server contains a denial of service caused by type confusion in resource access, letting unauthorized attackers deny service over a network, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
1.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-843

Vendor fix

Update to the latest version of Windows DHCP Server.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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