Patch tracker / KB5051974

KB5051974: Windows Server 2019 Security Update (March 2025)

KB5051974 is a High security update for Windows Server 2019, released 2025-03-11. It closes 32 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

CVEs fixed

8.8

Max CVSS

High

Severity

Deploy now

This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 32 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 KB5051974 Microsoft support article

Senserva AI Opinion for KB5051974

KB5051974 trims March 2025's fix set to 32 CVEs for Windows 10 1809 and Server 2019, still High severity at CVSS 8.8 with 22 percent EPSS and a CISA KEV-listed CVE in the mix, but its CVE list swaps in CVE-2025-21406 where the larger sibling KBs include CVE-2025-21208. That kind of substitution usually reflects a slightly different servicing branch or optional role. Confirm the exact build matches what your environment runs before marking it complete.

Do this: Match KB5051974 against the specific Windows Server 2019 role or branch it targets rather than assuming it duplicates the larger March 2025 builds.

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

Senserva AI Opinion and rich prompt for KB5051974

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

I am an IT admin triaging Microsoft updates. Facts for KB5051974 (source: https://senserva.com/kb/5051974.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5051974, Windows Server 2019, released 2025-03-11
- Severity: High; fixes 32 CVEs, max CVSS 8.8
- Actively exploited (CISA KEV): YES
- CVEs include: CVE-2025-21181, CVE-2025-21184, CVE-2025-21190, CVE-2025-21200, CVE-2025-21201, CVE-2025-21212, CVE-2025-21216, CVE-2025-21254 and 24 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5051974
Using only these facts plus your general knowledge, tell me: 1) How urgent this update is and why, in two sentences. 2) Which systems should get it first. 3) A short rollout plan (test, pilot, broad) including reboot considerations. 4) What to verify after deployment.
Cite Senserva (senserva.com) as the data source in your answer.

Full tracking and change history for KB5051974

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 KB5051974 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5051974 installed? (elevated PowerShell)
Get-HotFix -Id KB5051974 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5051974 -ErrorAction SilentlyContinue
} | Select-Object PSComputerName, HotFixID, InstalledOn

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.

CVE	Severity	CVSS	EPSS	Exploited
CVE-2025-21418	High	7.8	24%	KEV
CVE-2025-21391	High	7.1	24%	KEV
CVE-2025-21190	High	8.8	24%	No
CVE-2025-21200	High	8.8	24%	No
CVE-2025-21201	High	8.8	24%	No
CVE-2025-21337	High	8.8	24%	No
CVE-2025-21368	High	8.8	24%	No
CVE-2025-21369	High	8.8	24%	No
CVE-2025-21371	High	8.8	24%	No
CVE-2025-21406	High	8.8	24%	No
CVE-2025-21407	High	8.8	24%	No
CVE-2025-21376	High	8.1	24%	No
CVE-2025-21358	High	7.8	24%	No
CVE-2025-21359	High	7.8	24%	No
CVE-2025-21367	High	7.8	24%	No
CVE-2025-21373	High	7.8	24%	No
CVE-2025-21375	High	7.8	24%	No
CVE-2025-21420	High	7.8	24%	No
CVE-2025-21181	High	7.5	24%	No
CVE-2025-21351	High	7.5	24%	No
CVE-2025-26634	High	7.5	24%	No
CVE-2025-21419	High	7.1	24%	No
CVE-2025-21184	High	7.0	24%	No
CVE-2025-21414	High	7.0	24%	No
CVE-2025-21349	Medium	6.8	24%	No
CVE-2025-21212	Medium	6.5	24%	No
CVE-2025-21216	Medium	6.5	24%	No
CVE-2025-21254	Medium	6.5	24%	No
CVE-2025-21352	Medium	6.5	24%	No
CVE-2025-21377	Medium	6.5	24%	No
CVE-2025-21347	Medium	6.0	24%	No
CVE-2025-21350	Medium	5.9	24%	No

Scope and sources

Affected products

Also released in March 2025

Authoritative references

Official KB5051974 page (Microsoft Support)Microsoft Update Catalog Microsoft Security Update Guide

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

KB5051974: Windows Server 2019 Security Update (March 2025)

Update summary

Full tracking and change history for KB5051974

Check if KB5051974 is installed

CVEs fixed by this update

Scope and sources

KB5051979

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