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Fencer Intel
critical 9.8

CVE-2025-59287 kev in the critical feed json

Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

published last yr. modified 4mo ago also EUVD-2025-34268

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2025-10-24
epss
100.0%
EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
1
Metasploit, plus a Nuclei check

Summary

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

Patch / fix

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  • Microsoft Windows Server 2012 6.2.9200.25728
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.25728
  • Microsoft Windows Server 2012 R2 6.3.9600.22826
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.22826
  • Microsoft Windows Server 2016 10.0.14393.8524
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.8524
  • Microsoft Windows Server 2019 10.0.17763.7922
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.7922
  • Microsoft Windows Server 2022 10.0.20348.4297
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1916
  • Microsoft Windows Server 2025 10.0.26100.6905
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.6905

Is CVE-2025-59287 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. First public exploit (Metasploit exploit/windows/http/wsus_deserialization_rce)
  2. Published
  3. Added to CISA KEV
  4. CISA SSVC: exploitation active
  5. CISA patch deadline

Known exploited

Added
last yr.
Patch by
2025-11-14 (11mo ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
Microsoft, Windows
CISA name
Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

99.98% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.