Patch tracker / KB5071503
KB5071503: Windows Server 2019 Security Update (December 2025)
Microsoft security update released 2025-12-09. Fixes 11 CVEs.
All about KB5071503: 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.
KB5071503 is a High security update for Windows Server 2019, released 2025-12-09. It closes 11 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 2.1%. 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 KB5071503
Get the official update for KB5071503. The download and file size for each supported product are on the Microsoft Update Catalog page.
Update summary
Senserva AI Opinion for KB5071503
This December package is the most complete of the Windows 10 1809 and Server 2019 updates in this batch, closing eleven CVEs including CVE-2025-62567 in addition to the ten found in sibling packages, all topping out at Severity High, CVSS 8.8. Prefer this variant over a sibling KB that only covers ten CVEs when both are available for the same build. Confirm build number and language edition match before deployment.
Do this: Apply this eleven-CVE package in preference to sibling KBs that omit CVE-2025-62567.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5071503
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5071503
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 11 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.1%.
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 KB5071503 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 KB5071503
Any of these paths delivers KB5071503; 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 KB5071503 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 KB5071503, ranked by exploitation.
Common questions about KB5071503
Is KB5071503 urgent?
KB5071503 is rated High. Include it in your normal patch cycle unless your environment raises its priority.
How do I download KB5071503?
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 KB5071503 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 KB5071503?
Yes. This page includes a free, ready-to-paste AI prompt containing KB5071503'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.
