#VU107277 Heap-based buffer overflow in Windows and Windows Server - CVE-2025-27487

Vulnerability identifier: #VU107277

Vulnerability risk: High

CVSSv4.0: 5.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-27487

CWE-ID: CWE-122

Exploitation vector: 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 execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Remote Desktop Client. A remote attacker can trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

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 R2 6.1.7601.27618, 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-2025-27487

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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