Remote code execution in Windows Server Update Service (WSUS)

1) Deserialization of Untrusted Data

EUVDB-ID: #VU117222

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2025-59287

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data. A remote attacker send a crafted event that triggers unsafe object deserialization in a legacy serialization mechanism 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 Server: 2012 6.2.9200.24768 - 2025 10.0.26100.6584

CPE2.3

• cpe:2.3:o:microsoft:windows_server:2012:6.2.9200.25675:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.8422:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.7792:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2022:10.0.20348.4171:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2025:10.0.26100.6584:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-59287

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.