Patch tracker / KB5071413
KB5071413: Windows 10 Version 1809 for 32-bit Sys Security Update (December 2025)
Microsoft security update released 2025-12-09. Fixes 28 CVEs.
All about KB5071413: 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.
KB5071413 is a High security update for Windows 10 Version 1809 for 32-bit Sys, released 2025-12-09. It closes 28 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. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Exploitation is not theoretical here: at least one CVE this update fixes is on the CISA Known Exploited Vulnerabilities catalog, which means attackers are already using it against unpatched systems. For an update like this, the risk window is the gap between today and the day your last device installs it, so shortening that gap matters more than perfect scheduling.
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, including how to expedite it for the exploited CVE. 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 KB5071413
Get the official update for KB5071413. The download and file size for each supported product are on the Microsoft Update Catalog page.
Update summary
Senserva AI Opinion for KB5071413
KB5071413 addresses 28 CVEs in the same December 2025 Windows 11 25H2 and Windows 10 1809 servicing wave, again topping out at CVSS 8.8 with a confirmed CISA KEV entry among the fixes. The 2 percent EPSS score reflects general exploitation likelihood across all included CVEs, not the specific KEV bug, which is already being exploited. Treat exploitation status, not the EPSS number, as the driver for prioritization here.
Do this: Deploy KB5071413 to affected Windows 11 25H2 and Windows 10 1809 machines this patch cycle.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5071413
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5071413
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 28 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 2.4%.
Among the lower half of tracked Microsoft updates by EPSS exploit probability.
What to do
Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. Senserva flags whether KB5071413 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 KB5071413
Any of these paths delivers KB5071413; 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. For this update, consider an expedite policy: it bypasses deferrals for exactly this fix-now case.
- Windows Autopatch: rings, rollout, and pause or rollback are managed for you; exploited updates can be expedited.
- WSUS / Configuration Manager: approve KB5071413 for your device groups and set a deadline (deadline, not just approval, for an exploited fix).
- 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 KB5071413, ranked by exploitation.
Common questions about KB5071413
Is KB5071413 urgent?
Yes. KB5071413 fixes at least one vulnerability in the CISA Known Exploited Vulnerabilities catalog, meaning attackers are using it in the wild. Deploy it first.
How do I download KB5071413?
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 KB5071413 with Intune?
Assign a Windows Update ring (quality update policy) to the device groups and the update flows on the ring's deferral schedule. Because KB5071413 fixes an actively exploited CVE, an Intune expedite policy is the right tool: it bypasses configured deferrals and pushes the update as soon as devices check in. Verify the rollout with update compliance reporting rather than assuming delivery.
Can I ask my own AI about KB5071413?
Yes. This page includes a free, ready-to-paste AI prompt containing KB5071413'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.
