Patch tracker / KB5071543

KB5071543

Microsoft security update released 2025-12-09. Fixes 15 CVEs.

High

Download KB5071543

Get the official update for KB5071543. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5071543 Microsoft support article

Update summary

Released

2025-12-09

CVEs fixed

15

Max CVSS

8.8

Severity

High

Exploitation and severity

Fixes 15 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.2%.

Among the lower half of tracked Microsoft updates by EPSS exploit probability.

What to do

Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5071543 is missing on your devices.

CVEs fixed by this update

CVE-2025-54100 CVE-2025-59517 CVE-2025-62455 CVE-2025-62458 CVE-2025-62466 CVE-2025-62470 CVE-2025-62472 CVE-2025-62473 CVE-2025-62474 CVE-2025-62549 CVE-2025-62565 CVE-2025-62567 CVE-2025-62571 CVE-2025-62573 CVE-2025-64661

Affected products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019

References

Microsoft support article Microsoft Security Update Guide

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

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Lexicon: the terms on this page

CVE: Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB: Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV: CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS: Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS: Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC: Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD: National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware: The vulnerability is linked to known ransomware activity.