Patch tracker / KB5071544
KB5071544: Windows Server 2019 Security Update (December 2025)
KB5071544 is a High security update for Windows Server 2019, released 2025-12-09. It closes 26 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. It is the eighth largest of the 36 updates Microsoft shipped that month, by CVEs closed.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.
Update summary
Fixes 26 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.5%. 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: KB5126651 (2026-10-13). 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.
KB5071544 is a December 2025 rollup covering Windows 11 25H2 (ARM64 and x64) and Windows 10 1809, closing 26 CVEs with a top rating of High (CVSS 8.8). One of the fixed CVEs is listed in the CISA Known Exploited Vulnerabilities catalog, meaning confirmed real world exploitation, though none are tied to ransomware and the highest EPSS is only 2 percent.
Do this: Deploy KB5071544 across your 25H2 and 1809 fleet now, prioritizing internet-facing and unmanaged endpoints because of the CISA KEV-listed CVE it addresses.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5071544
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5071544
- Released
- 2025-12-09
- Last changed
- 2026-09-05
- 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 KB5071544 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-2025-62221 | High | 7.8 | 4.6% | KEV |
| CVE-2025-62549 | High | 8.8 | 4.6% | No |
| CVE-2025-54100 | High | 7.8 | 4.6% | No |
| CVE-2025-55233 | High | 7.8 | 4.6% | No |
| CVE-2025-59516 | High | 7.8 | 4.6% | No |
| CVE-2025-59517 | High | 7.8 | 4.6% | No |
| CVE-2025-62454 | High | 7.8 | 4.6% | No |
| CVE-2025-62455 | High | 7.8 | 2.5% | No |
| CVE-2025-62457 | High | 7.8 | 4.6% | No |
| CVE-2025-62458 | High | 7.8 | 2.5% | No |
| CVE-2025-62461 | High | 7.8 | 4.6% | No |
| CVE-2025-62462 | High | 7.8 | 4.6% | No |
| CVE-2025-62464 | High | 7.8 | 4.6% | No |
| CVE-2025-62466 | High | 7.8 | 4.6% | No |
| CVE-2025-62467 | High | 7.8 | 4.6% | No |
| CVE-2025-62470 | High | 7.8 | 4.6% | No |
| CVE-2025-62472 | High | 7.8 | 4.6% | No |
| CVE-2025-62474 | High | 7.8 | 4.6% | No |
| CVE-2025-62571 | High | 7.8 | 4.6% | No |
| CVE-2025-64661 | High | 7.8 | 4.6% | No |
| CVE-2025-64673 | High | 7.8 | 4.6% | No |
| CVE-2025-64658 | High | 7.5 | 4.6% | No |
| CVE-2025-62565 | High | 7.3 | 4.6% | No |
| CVE-2025-62573 | High | 7.0 | 4.6% | No |
| CVE-2025-62473 | Medium | 6.5 | 4.6% | No |
| CVE-2025-62567 | Medium | 5.3 | 4.6% | No |
Scope and sources
- Affected products
- Also released in December 2025
KB5071413
28 CVEs · High · exploitedKB5071417
30 CVEs · High · exploitedKB5071542
30 CVEs · High · exploitedKB5071546
28 CVEs · High · exploitedKB5071547
29 CVEs · High · exploitedKB5072014
33 CVEs · High · exploitedKB5072033
34 CVEs · High · exploitedKB5002815
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.