Patch tracker / KB5051972

KB5051972: Windows Server 2012 Security Update (February 2025)

KB5051972 is a Medium security update for Windows Server 2012, released 2025-02-11. It closes 1 CVE with a maximum CVSS of 6.5. The most likely of them to be attacked is CVE-2025-21377, which FIRST.org rates at 40% probability of exploitation in the next 30 days.

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Update summary

Medium
2025-02-11
Released
1
CVEs fixed
6.5
Max CVSS v3
Medium
Severity
Deploy this cycle
Fixes 1 CVE for Windows Server 2012. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 6.5 (Medium). EPSS exploit probability up to 40%. Among the top 25% of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Windows Server 2008 for 32-bit Systems Service Pack 2 has shipped since this one: KB5073697 (2026-01-13). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5051972Microsoft support article
Senserva AI Opinion for KB5051972

KB5051972 is a February 2025 update for Windows 10 1809 and Windows Server 2019 fixing a single Medium Severity vulnerability, CVE-2025-21377, rated 6.5. Despite the modest CVSS score, its 22 percent EPSS reading is notable for a single-CVE Medium fix, and this CVE class relates to NTLM hash disclosure, which attackers can chain with other techniques for credential theft.

Do this: Deploy KB5051972 to Windows 10 1809 and Windows Server 2019 systems as part of routine patching.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5051972

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5051972

Released
2025-02-11
Last changed
2026-09-24
Changes tracked
4

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5051972 is installed

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CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2025-21377Medium6.540%No

Scope and sources

Affected products
Also released in February 2025

KB5051974

32 CVEs · High · exploited

KB5051979

34 CVEs · High · exploited

KB5051980

34 CVEs · High · exploited

KB5051987

38 CVEs · High · exploited

KB5051989

32 CVEs · High · exploited

KB5052000

34 CVEs · High · exploited

KB5052006

33 CVEs · High · exploited

KB5052016

21 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5051972 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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