Out-of-Bounds Read in Windows DHCP Server

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

CVSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-77893

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	dhcp_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in the Windows DHCP Server. It allows an unauthorized attacker to read memory outside the intended buffer, potentially causing a denial of service over the network.

Impact Analysis

An attacker could exploit this to crash the DHCP server, disrupting network services for clients relying on it for IP address assignment. This may lead to network downtime or connectivity issues.

Mitigation Strategies

Apply the latest security updates from Microsoft for the Windows DHCP Server to patch the out-of-bounds read vulnerability. Monitor Microsoft's security advisories for updates and disable the DHCP Server service if an immediate patch is unavailable.

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