Patch tracker / KB5052020
KB5052020: Windows Server 2019 Security Update (February 2025)
KB5052020 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.
KB5052020 extends the February 2025 fix set to 23 CVEs for Windows 10 1809 and Server 2019 by adding CVE-2025-21420 to the list seen in KB5052016, while holding the same High, CVSS 8.8 severity, 22 percent EPSS, and CISA KEV listing. This incremental growth across sibling KBs in the same month reflects Microsoft folding additional fixes into later servicing builds. Later is generally better here, provided compatibility testing has cleared it.
Do this: Prefer KB5052020 over its narrower siblings for February 2025 once compatibility testing confirms it, since it closes the largest CVE set in this sub-family.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5052020
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5052020
- 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 KB5052020 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.
| 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 · exploitedKB5052032
20 CVEs · High · exploitedKB5052038
20 CVEs · High · exploitedKB5052042
23 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.