Patch tracker / KB5048800
KB5048800: Windows Server 2019 Security Update (December 2024)
KB5048800 is a Critical security update for Windows Server 2019, released 2024-12-10. It closes 42 CVEs with a maximum CVSS of 9.8. 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.
Microsoft security update released 2024-12-10. Fixes 42 CVEs.
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.
Updated July 24, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Download KB5048800
Get the official update for KB5048800. The download and file size for each supported product are on the Microsoft Update Catalog page.
Update summary
Senserva AI Opinion for KB5048800
This December 10, 2024 package resolves 42 CVEs for Windows 10 Version 1809 and Windows Server 2019, sharing the Critical, CVSS 9.8, 84 percent EPSS, confirmed CISA KEV rating found across the whole month's release. It sits in the middle of the CVE-count range for this update wave, so treat it as one option among several servicing branches.
Do this: Confirm which servicing branch applies to your fleet and that this 42-CVE build, or a broader sibling, is installed.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5048800
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5048800
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 42 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 83%.
Among the top 5% 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 KB5048800 is missing on your devices.
Check if KB5048800 is installed
Copy-paste PowerShell: one machine, or your whole fleet in one pass. No output means the update is not installed.
Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.
Known issues
Microsoft's support article for KB5048800 lists no known issues as of 2026-07-22. Check the article before broad deployment; Microsoft updates it as reports come in.
Writing about KB5048800? Cite this page
Copy-paste for a blog post, forum answer, or internal doc. The link always carries the current risk data.
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-2024-49138 | Critical | 9.8 | 83% | KEV |
| CVE-2024-43583 | Critical | 9.8 | 83% | No |
| CVE-2024-49072 | Critical | 9.8 | 83% | No |
| CVE-2024-49075 | Critical | 9.8 | 83% | No |
| CVE-2024-49076 | Critical | 9.8 | 83% | No |
| CVE-2024-49079 | Critical | 9.8 | 83% | No |
| CVE-2024-49080 | Critical | 9.8 | 83% | No |
| CVE-2024-49082 | Critical | 9.8 | 83% | No |
| CVE-2024-49084 | Critical | 9.8 | 83% | No |
| CVE-2024-49085 | Critical | 9.8 | 83% | No |
| CVE-2024-49086 | Critical | 9.8 | 83% | No |
| CVE-2024-49088 | Critical | 9.8 | 83% | No |
| CVE-2024-49089 | Critical | 9.8 | 83% | No |
| CVE-2024-49090 | Critical | 9.8 | 83% | No |
| CVE-2024-49091 | Critical | 9.8 | 83% | No |
| CVE-2024-49095 | Critical | 9.8 | 83% | No |
| CVE-2024-49096 | Critical | 9.8 | 83% | No |
| CVE-2024-49097 | Critical | 9.8 | 83% | No |
| CVE-2024-49102 | Critical | 9.8 | 83% | No |
| CVE-2024-49104 | Critical | 9.8 | 83% | No |
| CVE-2024-49105 | Critical | 9.8 | 83% | No |
| CVE-2024-49106 | Critical | 9.8 | 83% | No |
| CVE-2024-49107 | Critical | 9.8 | 83% | No |
| CVE-2024-49108 | Critical | 9.8 | 83% | No |
| CVE-2024-49112 | Critical | 9.8 | 83% | No |
| CVE-2024-49113 | Critical | 9.8 | 83% | No |
| CVE-2024-49114 | Critical | 9.8 | 83% | No |
| CVE-2024-49115 | Critical | 9.8 | 83% | No |
| CVE-2024-49116 | Critical | 9.8 | 83% | No |
| CVE-2024-49117 | Critical | 9.8 | 83% | No |
| CVE-2024-49118 | Critical | 9.8 | 83% | No |
| CVE-2024-49119 | Critical | 9.8 | 83% | No |
| CVE-2024-49120 | Critical | 9.8 | 83% | No |
| CVE-2024-49121 | Critical | 9.8 | 83% | No |
| CVE-2024-49122 | Critical | 9.8 | 83% | No |
| CVE-2024-49123 | Critical | 9.8 | 83% | No |
| CVE-2024-49124 | Critical | 9.8 | 83% | No |
| CVE-2024-49125 | Critical | 9.8 | 83% | No |
| CVE-2024-49126 | Critical | 9.8 | 83% | No |
| CVE-2024-49127 | Critical | 9.8 | 83% | No |
| CVE-2024-49129 | Critical | 9.8 | 83% | No |
| CVE-2024-49132 | Critical | 9.8 | 83% | No |
Affected products
Also released in December 2024
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
How to install KB5048800
Any of these paths delivers KB5048800; 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 KB5048800 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 KB5048800, ranked by exploitation.
Common questions about KB5048800
Does KB5048800 have known issues?
Microsoft's support article for KB5048800 lists no known issues as of 2026-07-22. Check the article before broad deployment; Microsoft updates it as reports come in.
Is KB5048800 urgent?
Yes. KB5048800 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 KB5048800?
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 KB5048800 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 KB5048800 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 KB5048800?
Yes. This page includes a free, ready-to-paste AI prompt containing KB5048800'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.
