Patch tracker / KB5051980

KB5051980: Windows Server 2019 Security Update (March 2025)

KB5051980 is a High security update for Windows Server 2019, released 2025-03-11. It closes 34 CVEs with a maximum CVSS of 8.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. The most likely of them to be attacked is CVE-2025-26634, which FIRST.org rates at 24% probability of exploitation in the next 30 days.

Update summary

HighCISA KEV
2025-03-11
Released
34
CVEs fixed
8.8
Max CVSS
High
Severity
Deploy now
This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 34 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 24%. Among the top half 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 10 Version 1809 for 32-bit Systems has shipped since this one: KB5094041 (2026-08-11). 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 KB5051980Microsoft support article
Senserva AI Opinion for KB5051980

KB5051980 is one more March 2025 vehicle for the same 34-CVE fix set as KB5052000, targeting Windows 10 1809 and Windows Server 2019 with High severity, CVSS 8.8, 22 percent EPSS, and a CISA KEV-listed CVE. At four-plus overlapping KBs for one month, the real work for admins is confirming coverage by CVE ID in their vulnerability scanner rather than chasing each KB number individually. The exploited flaw does not care which package closes it.

Do this: Use CVE-level scanning to confirm KB5051980's fix set is closed on affected hosts, rather than tracking the KB number alone.

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

Senserva AI Opinion and rich prompt for KB5051980

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

Full tracking and change history for KB5051980

Released
2025-03-11
Last changed
2026-07-21
Changes tracked
3

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 KB5051980 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-2025-21418High7.824%KEV
CVE-2025-21391High7.124%KEV
CVE-2025-21190High8.824%No
CVE-2025-21200High8.824%No
CVE-2025-21201High8.824%No
CVE-2025-21208High8.824%No
CVE-2025-21337High8.824%No
CVE-2025-21368High8.824%No
CVE-2025-21369High8.824%No
CVE-2025-21371High8.824%No
CVE-2025-21406High8.824%No
CVE-2025-21407High8.824%No
CVE-2025-21410High8.824%No
CVE-2025-21376High8.124%No
CVE-2025-21358High7.824%No
CVE-2025-21359High7.824%No
CVE-2025-21367High7.824%No
CVE-2025-21373High7.824%No
CVE-2025-21375High7.824%No
CVE-2025-21420High7.824%No
CVE-2025-21181High7.524%No
CVE-2025-21351High7.524%No
CVE-2025-26634High7.524%No
CVE-2025-21419High7.124%No
CVE-2025-21184High7.024%No
CVE-2025-21414High7.024%No
CVE-2025-21349Medium6.824%No
CVE-2025-21212Medium6.524%No
CVE-2025-21216Medium6.524%No
CVE-2025-21254Medium6.524%No
CVE-2025-21352Medium6.524%No
CVE-2025-21377Medium6.524%No
CVE-2025-21347Medium6.024%No
CVE-2025-21350Medium5.924%No

Scope and sources

Affected products
Also released in March 2025

KB5051974

32 CVEs · High · exploited

KB5051979

34 CVEs · High · exploited

KB5051987

38 CVEs · High · exploited

KB5051989

32 CVEs · High · exploited

KB5052000

34 CVEs · High · exploited

KB5052006

33 CVEs · High · exploited

KB5052040

27 CVEs · High · exploited

KB5053594

34 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5051980 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.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.