Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

CRITIQUE 9.8EXPLOITED (CISA KEV)CVE-2025-59287 · Published 14/10/2025 · updated 17/06/2026

Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 24/10/2025. Patch affected systems as an emergency.

En bref

CVE-2025-59287 est une vulnérabilité CRITIQUE (CVSS 9.8).
Exploitée activement : la CISA l'a ajoutée au catalogue KEV le 24/10/2025.
Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 100.0%, plus élevée que 100.0% des vulnérabilités.
Aucune version corrigée n'est encore connue : suivez l'avis de l'éditeur dans les références.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59287 · Vendor Advisory
hawktrace.com/blog/CVE-2025-59287 · Exploit
bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-windows-server-wsus-flaw-exploited-in-attacks · Press/Media Coverage
vicarius.io/vsociety/posts/cve-2025-59287-detection-script-rce-vulnerability-in-windows-server-update-service · Third Party Advisory
vicarius.io/vsociety/posts/cve-2025-59287-mitigation-script-rce-vulnerability-in-windows-server-update-service · Mitigation
gist.github.com/hawktrace/880b54fb9c07ddb028baaae401bd3951 · Third Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · Third Party Advisory
CISA KEV · CVE-2025-59287

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