Patch tracker / KB5071543
KB5071543: Windows Server 2019 Security Update (December 2025)
Microsoft security update released 2025-12-09. Fixes 15 CVEs.
All about KB5071543: the download, the Senserva AI read, install guidance, the CVEs it fixes, and its change history.
Which of your devices are missing it? Find out free with a full Microsoft 365 audit.
KB5071543 is a High security update for Windows Server 2019, released 2025-12-09. It closes 15 CVEs with a maximum CVSS of 8.8. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
No exploitation is confirmed for the CVEs in this update and the EPSS exploitation probability is currently 2.3%. That can change: CVEs from past updates regularly get exploited months later, which is why deploying on your normal cadence, without exceptions that linger, is what keeps this one boring.
Most organizations deliver an update like this automatically through Intune update rings, Windows Update for Business, Windows Autopatch, or WSUS; the install section below covers each path. For the bigger picture: how the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Download KB5071543
Get the official update for KB5071543. The download and file size for each supported product are on the Microsoft Update Catalog page.
Update summary
Senserva AI Opinion for KB5071543
This is the largest Windows 10 version 1809 and Windows Server 2019 update in this batch, closing fifteen CVEs in one December release, with a top Severity of High at CVSS 8.8. Both client and server systems on this legacy-but-still-supported build are exposed to the full set. Fifteen CVEs in a single monthly rollup is a heavier than average patch load, so allocate enough testing time before wide deployment.
Do this: Prioritize testing and deployment of this Windows 10 1809 and Server 2019 update given the fifteen bundled CVEs.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5071543
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5071543
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.
Exploitation and severity
Fixes 15 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.3%.
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
Affected products
Also released in December 2025
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
How to install KB5071543
Any of these paths delivers KB5071543; most organizations already have one of the first three running:
- Intune update rings (Windows Update for Business): the update flows on each ring's deferral schedule.
- Windows Autopatch: rings, rollout, and pause or rollback are managed for you; exploited updates can be expedited.
- WSUS / Configuration Manager: approve KB5071543 for your device groups and set a deadline.
- Manual: download from the Update Catalog above and install; fine for a handful of machines, unmanageable at any real scale.
After the rollout, verify rather than assume: update compliance reporting in Intune or Autopatch shows which devices actually installed it, and Siemserva reads Intune, Defender, Autopatch, and Azure Update Manager together to show the devices still missing KB5071543, ranked by exploitation.
Common questions about KB5071543
Is KB5071543 urgent?
KB5071543 is rated High. Include it in your normal patch cycle unless your environment raises its priority.
How do I download KB5071543?
From the Microsoft Update Catalog (linked on this page), or let Intune, Windows Update for Business, Windows Autopatch, or WSUS deliver it. The catalog page lists the download for each supported product.
How do I deploy KB5071543 with Intune?
Assign a Windows Update ring (quality update policy) to the device groups and the update flows on the ring's deferral schedule. For urgent updates, Intune expedite policies can bypass the ring deferrals. Verify the rollout with update compliance reporting rather than assuming delivery.
Can I ask my own AI about KB5071543?
Yes. This page includes a free, ready-to-paste AI prompt containing KB5071543's key facts: severity, CVE count, exploitation status, and the download link. Copy it into Claude, ChatGPT, or Copilot for a rollout plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.
