Patch tracker / KB5052106

KB5052106: Windows Server 2019 Security Update (February 2025)

KB5052106 is a High security update for Windows Server 2019, released 2025-02-11. It closes 33 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-2025-21351, which FIRST.org rates at 24% probability of exploitation in the next 30 days.

Update summary

HighCISA KEV

2025-02-11

Released

CVEs fixed

8.8

Max CVSS

High

Severity

Deploy now

This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 33 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 KB5052106 Microsoft support article

Senserva AI Opinion for KB5052106

KB5052106 is February 2025's cumulative update for Windows 10 1809 and Windows Server 2019, closing 33 CVEs with a High, CVSS 8.8 top severity, 22 percent EPSS, and a CISA KEV-listed flaw among them. This predates the March 2025 update family covered elsewhere in this catalog, so hosts need both months applied in sequence, not just the latest one. Skipping a month on Server 2019 compounds the exposure window.

Do this: Confirm KB5052106 is installed before layering on March 2025 updates, since Windows servicing is cumulative and skipping this month leaves the February CVEs open.

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

Senserva AI Opinion and rich prompt for KB5052106

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 KB5052106 (source: https://senserva.com/kb/5052106.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5052106, Windows Server 2019, released 2025-02-11
- Severity: High; fixes 33 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-2025-21208, CVE-2025-21212, CVE-2025-21216 and 25 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5052106
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 KB5052106

Released: 2025-02-11
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 KB5052106 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5052106 installed? (elevated PowerShell)
Get-HotFix -Id KB5052106 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5052106 -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-2025-21208	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-2025-21410	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-2025-21419	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 February 2025

Authoritative references

Official KB5052106 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.

KB5052106: Windows Server 2019 Security Update (February 2025)

Update summary

Full tracking and change history for KB5052106

Check if KB5052106 is installed

CVEs fixed by this update

Scope and sources

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