Sensitive Data Storage in Improperly Locked Memory in Microsoft Windows and Windows Server - CVE-2025-26686

Vulnerability identifier: #VU107239

CSH Severity: Medium

CVSS v4: 7.3 [CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-26686

CWE-ID: CWE-591

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to an error when handling DHCPv6 replies. A remote attacker can send a specially crafted DHCPv6 reply with a fake IPv6 address and execute arbitrary code on the system.

Successful exploitation of the vulnerability requires a user to initiate a connection to send a DHCPv6 request.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.5737, 10 22H2 10.0.19045.5737, 10 1607 10.0.14393.7970, 10 1809 10.0.17763.7137, 11 22H2 10.0.22621.5191, 11 23H2 10.0.22631.5191, 11 24H2 10.0.26100.3775
Windows Server - addressed in versions 2008 R2 6.1.7601.27670, 2008 6.0.6003.23220, 2012 R2 6.3.9600.22523, 2012 6.2.9200.25423, 2016 10.0.14393.7970, 2019 10.0.17763.7137, 2022 23H2 10.0.25398.1551, 2022 10.0.20348.3454, 2025 10.0.26100.3775

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26686

• Remote code execution in Microsoft Windows TCP/IP