Secuno
ENNL
Book demo

CVE-2025-59287

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

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 100.0%
  1. Published14 Oct 2025
  2. Added to CISA KEV24 Oct 2025
  3. Remediation due14 Nov 2025
Actively exploited (CISA KEV)

Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.

Added to KEV: 24 Oct 2025Federal remediation due: 14 Nov 2025

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.8524
Microsoft Windows Server 2019< 10.0.17763.7922
Microsoft Windows Server 2022< 10.0.20348.4297
Microsoft Windows Server 2022 23h2< 10.0.25398.1916
Microsoft Windows Server 2025< 10.0.26100.6905

Remediation

Fixed in
Microsoft Windows Server 2016≥ 10.0.14393.8524
Microsoft Windows Server 2019≥ 10.0.17763.7922
Microsoft Windows Server 2022≥ 10.0.20348.4297
Microsoft Windows Server 2022 23h2≥ 10.0.25398.1916
Microsoft Windows Server 2025≥ 10.0.26100.6905

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1092378.1
Crawl4AI from 0.9.0 before 0.9.4 contains an untrusted-config gate bypass that allows…
CVE-2026-1093918.1
Square Squash through commit e73f280 contains an insecure deserialization vulnerability…
CVE-2026-126138.8
Deserialization of untrusted data vulnerability in Ministry of Justice General…
CVE-2026-529038.8
A deserialization of untrusted data vulnerability was found in ManageIQ. The…
CVE-2026-817979.8
Unauthenticated PHP Object Injection in Buzz Stone | Magazine & Viral Blog WordPress…
CVE-2026-785359.8
Unauthenticated PHP Object Injection in Photolia <= 1.0.3…

Frequently asked

Is CVE-2025-59287 being actively exploited?

Yes. CVE-2025-59287 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 24 Oct 2025.

How severe is CVE-2025-59287?

CVE-2025-59287 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2025-59287?

Affected products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, and 1 more.

How do I fix CVE-2025-59287?

Upgrade affected software to a fixed version, for example Microsoft Windows Server 2016 10.0.14393.8524, Microsoft Windows Server 2019 10.0.17763.7922, Microsoft Windows Server 2022 10.0.20348.4297 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-59287 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.