Patch tracker / KB5048735
KB5048735: Windows Server 2019 Security Update (December 2024)
KB5048735 is a Critical security update for Windows Server 2019, released 2024-12-10. It closes 27 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. The most likely of them to be attacked is CVE-2024-49084, which FIRST.org rates at 83% probability of exploitation in the next 30 days.
Update summary
Fixes 27 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.
A newer security update for Windows 10 Version 1809 for 32-bit Systems has shipped since this one: KB5094041 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
Microsoft documents 1 known issue with this update.
- We are currently not aware of any issues with this update. For the most up-to-date information about known issues for Windows Server 2012 R2, please...
Fixing 27 CVEs, this December 10, 2024 package for Windows 10 Version 1809 and Windows Server 2019 closes out the group of similarly sized updates in this wave, again rated up to Critical at CVSS 9.8 with an 84 percent EPSS score and confirmed CISA KEV status. Across all these December builds, the underlying message is the same: this month carries a confirmed-exploited Critical vulnerability that needs full fleet coverage.
Do this: Finish reconciling December 2024 patch coverage by confirming this 27-CVE build, or an equivalent, reaches every remaining Windows 10 1809 and Server 2019 system.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5048735
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5048735
- Released
- 2024-12-10
- Last changed
- 2026-07-19
- Changes tracked
- 6
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.
Check if KB5048735 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5048735 (checked 2026-08-10). Verify against the article before acting.
We are currently not aware of any issues with this update. For the most up-to-date information about known issues for Windows Server 2012 R2, please go to the Windows release health dashboard .
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 | High | 7.8 | 83% | KEV |
| CVE-2024-49112 | Critical | 9.8 | 83% | No |
| CVE-2024-49080 | High | 8.8 | 83% | No |
| CVE-2024-49085 | High | 8.8 | 83% | No |
| CVE-2024-49086 | High | 8.8 | 83% | No |
| CVE-2024-49102 | High | 8.8 | 83% | No |
| CVE-2024-49104 | High | 8.8 | 83% | No |
| CVE-2024-49125 | High | 8.8 | 83% | No |
| CVE-2024-49105 | High | 8.4 | 83% | No |
| CVE-2024-49118 | High | 8.1 | 83% | No |
| CVE-2024-49122 | High | 8.1 | 83% | No |
| CVE-2024-49124 | High | 8.1 | 83% | No |
| CVE-2024-49126 | High | 8.1 | 83% | No |
| CVE-2024-49127 | High | 8.1 | 83% | No |
| CVE-2024-43583 | High | 7.8 | 83% | No |
| CVE-2024-49072 | High | 7.8 | 83% | No |
| CVE-2024-49079 | High | 7.8 | 83% | No |
| CVE-2024-49088 | High | 7.8 | 83% | No |
| CVE-2024-49090 | High | 7.8 | 83% | No |
| CVE-2024-49096 | High | 7.5 | 83% | No |
| CVE-2024-49113 | High | 7.5 | 83% | No |
| CVE-2024-49121 | High | 7.5 | 83% | No |
| CVE-2024-49129 | High | 7.5 | 83% | No |
| CVE-2024-49089 | High | 7.2 | 83% | No |
| CVE-2024-49091 | High | 7.2 | 83% | No |
| CVE-2024-49084 | High | 7.0 | 83% | No |
| CVE-2024-49082 | Medium | 6.8 | 83% | No |
Scope and sources
- Affected products
- Also released in December 2024
KB5048652
46 CVEs · Critical · exploitedKB5048653
56 CVEs · Critical · exploitedKB5048654
41 CVEs · Critical · exploitedKB5048661
55 CVEs · Critical · exploitedKB5048667
57 CVEs · Critical · exploitedKB5048671
32 CVEs · Critical · exploitedKB5048676
24 CVEs · Critical · exploitedKB5048685
46 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.