#VU107239 Sensitive Data Storage in Improperly Locked Memory in Windows and Windows Server - CVE-2025-26686

Vulnerability identifier: #VU107239

Vulnerability risk: Medium

CVSSv4.0: 4.4 [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/E:U/U:Green]

CVE-ID: CVE-2025-26686

CWE-ID: CWE-591

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 21H2 10.0.19041.3920 - 10 21H2 10.0.19044.5608, 10 22H2 10.0.19041.3920 - 10 22H2 10.0.19045.5608, 10 1607 10.0.14393.10 - 10 1607 10.0.14393.7876, 10 1809 10.0.17763.1 - 10 1809 10.0.17763.7009, 11 22H2 10.0.22449.1000 - 11 22H2 10.0.22621.5039, 11 23H2 10.0.22631.1825 - 11 23H2 10.0.22631.5039, 11 24H2 10.0.26052.1000 - 11 24H2 10.0.26100.3476

Windows Server: 2008 R2 SP1 - 2008 6.0.6003.23168, 2012 Gold - 2012 6.2.9200.25368, 2016 10.0.14393.10 - 2016 10.0.14393.7876, 2019 10.0.17763.1 - 2019 10.0.17763.7009, 2022 10.0.20348.202 - 2022 23H2 10.0.25398.1486, 2025 10.0.26100.1742 - 2025 10.0.26100.3476

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.