CVE-2025-59287 (GCVE-0-2025-59287)

Vulnerability from cvelistv5 – Published: 2025-10-14 17:01 – Updated: 2026-02-26 16:58
VLAI CISA Shadowserver KEVIntel
Title
Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
Summary
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Severity
9.8 (Critical)
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows Server 2012 Affected: 6.2.9200.0 , < 6.2.9200.25728 (custom)
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Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.9200.0 , < 6.2.9200.25728 (custom)
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Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.22826 (custom)
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Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.22826 (custom)
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Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.8524 (custom)
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Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.8524 (custom)
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Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.7922 (custom)
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Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.7922 (custom)
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Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.4297 (custom)
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Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Affected: 10.0.25398.0 , < 10.0.25398.1916 (custom)
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Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.6905 (custom)
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Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.6905 (custom)
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Date Public
2025-10-14 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 003f07c3-4b1e-4dc4-99d8-ca33d0431528

Vulnerability ID: CVE-2025-59287

Status: Confirmed

Status Updated: 2025-10-24 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-10-24
Asserted: 2025-10-24
Scope
Notes: KEV entry: Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution. | 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. | Due date: 2025-11-14 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-59287 ; https://nvd.nist.gov/vuln/detail/CVE-2025-59287
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-502
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2025-11-14
Date Added 2025-10-24
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1c6d3144-62fe-433a-a6f4-ac60075d0d29

Vulnerability ID: CVE-2025-59287

Status: Confirmed

Status Updated: 2026-06-30 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2025-10-25
Asserted: 2025-10-25
Last Seen: 2026-06-30
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Microsoft / Windows Server Update Service | Class: other-software | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-06-30: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 1
Vendor Microsoft
30D Avg 11
90D Avg 4
Product Windows Server Update Service
Cisa Kev yes
Connections 1
Observation Date 2026-06-30
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-07-02 01:02 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e8db8e4a-e5da-49c4-9937-5758c068e3ec

Vulnerability ID: CVE-2025-59287

Status: Confirmed

Status Updated: 2026-06-01 10:42 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Windows Server Update Service (WSUS) Remote Code Execution Vulnerability | Affected: Microsoft / Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) | CVSS: 9.8 (CRITICAL) | EPSS: 0.99962 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
Vendor Microsoft
Product Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Added Date 2026-06-01T10:42:54.681Z
Cvss Score 9.8
Epss Score 0.99962
Cvss Severity CRITICAL
Epss Percentile 0.99976
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-06-23 14:03 UTC
Show details on NVD website
To clipboard 

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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.