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CVE-2025-59287: Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2025-59287
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.

CSIRTS triage

vendor: Microsoftproduct: Windows Server Update ServiceRemote code execution
What
A deserialization of untrusted data vulnerability allows for remote code execution.
Who is affected
Deployments of Microsoft Windows Server Update Service.
Urgency
Immediate remediation is necessary as the vulnerability is actively exploited and rated critical.
Action
Install the latest updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-10-24
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-59287

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-59287coverage & exploitation statusNVD · CVE.org

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