How severe is CVE-2025-59287?

CVE-2025-59287 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-59287?

Affected package information for CVE-2025-59287 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-59287?

No fixed version has been published for CVE-2025-59287 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-59287 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2025-59287, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2025-59287?

CVE-2025-59287 has an EPSS (Exploit Prediction Scoring System) score of 68.8%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2025-59287 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-59287 (Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-10-24. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-11-14. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-59287?

CVE-2025-59287 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2025-59287?

CVE-2025-59287 affects microsoft windows server 2012 (1 version, e.g. r2); microsoft windows server 2016; microsoft windows server 2019; microsoft windows server 2022, and 2 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2025-59287?

A Nuclei detection template exists for CVE-2025-59287, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2025-59287 published, and has it been updated?

CVE-2025-59287 was published on October 14, 2025 and was last updated on November 12, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-10-24 — agencies required to remediate by 2025-11-14

CVE-2025-59287

CRITICAL

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

Published

Oct 14, 2025

Updated

Nov 12, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

68.8%probability of exploitation in next 30 days

High Risk99th percentile-0.31%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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

Affected Products

6 products · 7 configurations

windows server 2012microsoft

1 version

windows server 2016microsoft

< 10.0.14393.8524

range

windows server 2019microsoft

< 10.0.17763.7922

range

windows server 2022microsoft

< 10.0.20348.4297

range

windows server 2022 23h2microsoft

< 10.0.25398.1916

range

windows server 2025microsoft

< 10.0.26100.6905

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

M507/CVE-2025-59287-PoC

Unauthenticated RCE PoC in Microsoft Windows Server Update Service (WSUS

⭐ 13🍴 3May 2026

Frequently Asked Questions

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

O3 Security · Impact-Aware SCA

Is CVE-2025-59287 in your stack?

O3 detects CVE-2025-59287 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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