Patch tracker / KB5052042
KB5052042: Windows Server 2019 Security Update (February 2025)
KB5052042 is a High security update for Windows Server 2019, released 2025-02-11. It closes 23 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-2025-21352, which FIRST.org rates at 24% probability of exploitation in the next 30 days.
Update summary
Fixes 23 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.
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.
KB5052042 matches KB5052020's 23-CVE February 2025 fix list for Windows 10 1809 and Windows Server 2019, again High severity at CVSS 8.8, 22 percent EPSS, and a CISA KEV-listed vulnerability included. With this many overlapping builds across one month, the operational takeaway is the same throughout: track by CVE closure, and pick one canonical build per servicing branch to avoid confusion during audits. The underlying exploited flaw is unchanged across all of them.
Do this: Pick one of KB5052020 or KB5052042 as the canonical February 2025 build for its branch and retire tracking the other to reduce audit confusion.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5052042
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5052042
- 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 KB5052042 is installed
Elevated PowerShell. No output means it is not installed.
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-2025-21190 | 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-2025-21359 | 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-2025-21419 | High | 7.1 | 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
KB5052016
21 CVEs · High · exploitedKB5052020
23 CVEs · High · exploitedKB5052032
20 CVEs · High · exploitedKB5052038
20 CVEs · High · exploitedKB5052072
19 CVEs · High · exploitedKB5052105
37 CVEs · High · exploitedKB5052106
33 CVEs · High · exploitedKB5002678
1 CVE · HighThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.