Patch tracker / KB5049983
KB5049983: Windows Server 2019 Security Update (January 2025)
KB5049983 is a Critical security update for Windows Server 2019, released 2025-01-14. It closes 122 CVEs with a maximum CVSS of 9.8. The most likely of them to be attacked is CVE-2024-49120, which FIRST.org rates at 83% probability of exploitation in the next 30 days.
Update summary
Fixes 122 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 81%. Among the top 10% 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.
KB5049983 is a large January 2025 rollup for Windows 10 version 1809 and Windows Server 2019, closing 122 CVEs including one rated Critical at CVSS 9.8 with an 81 percent EPSS score, meaning exploitation is statistically likely even though it is not yet in CISA KEV or tied to ransomware. Anyone still running 1809 or Server 2019 domain controllers, file servers, and legacy endpoints is exposed to a wide flaw surface in a single patch. The high EPSS on the top CVE means the window to patch before working exploits circulate is short.
Do this: Deploy KB5049983 to all Windows 10 1809 and Windows Server 2019 systems this week, prioritizing internet-facing servers and domain controllers.
AI-generated from public data, 2026-07-23. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5049983
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5049983
- Released
- 2025-01-14
- Last changed
- 2025-01-14
- Changes tracked
- 1
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 KB5049983 is installed
Elevated PowerShell. No output means it is not installed.
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.
Scope and sources
- Affected products
- Also released in January 2025
KB5049981
121 CVEs · Critical · exploitedKB5049984
128 CVEs · Critical · exploitedKB5050009
128 CVEs · Critical · exploitedKB5050021
121 CVEs · Critical · exploitedKB5049993
112 CVEs · CriticalKB5050004
93 CVEs · CriticalKB5050006
71 CVEs · CriticalKB5050008
118 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.