Patch tracker / KB5050063

KB5050063: Windows Server 2019 Security Update (January 2025)

KB5050063 is a Critical security update for Windows Server 2019, released 2025-01-14. It closes 73 CVEs with a maximum CVSS of 9.8. The most likely of them to be attacked is CVE-2025-21411, which FIRST.org rates at 81% probability of exploitation in the next 30 days.

Update summary

Critical
2025-01-14
Released
73
CVEs fixed
9.8
Max CVSS
Critical
Severity
Deploy this cycle
Fixes 73 CVEs for Windows Server 2019. No confirmed in-the-wild exploitation in this set today.

Fixes 73 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.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

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 Update Catalog: download KB5050063Microsoft support article
Senserva AI Opinion for KB5050063

KB5050063 is a smaller-footprint variant of the January 2025 Windows 10 1809 and Windows Server 2019 update, fixing 73 CVEs but still capped at Critical 9.8 and the same 81 percent EPSS score as the larger sibling packages. Fewer CVEs does not mean lower urgency here, the exploitation-probability reading is identical across the whole family of January KBs.

Do this: Install KB5050063 on any Windows 10 1809 or Windows Server 2019 systems that received this specific build rather than a sibling KB.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5050063

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5050063

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 KB5050063 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.

CVESeverityCVSSEPSSExploited
CVE-2025-21189Critical9.881%No
CVE-2025-21210Critical9.881%No
CVE-2025-21214Critical9.881%No
CVE-2025-21268Critical9.881%No
CVE-2025-21269Critical9.881%No
CVE-2025-21298Critical9.881%No
CVE-2025-21307Critical9.881%No
CVE-2025-21328Critical9.881%No
CVE-2025-21329Critical9.881%No
CVE-2025-21332Critical9.881%No
CVE-2025-21223High8.881%No
CVE-2025-21233High8.881%No
CVE-2025-21236High8.881%No
CVE-2025-21237High8.881%No
CVE-2025-21238High8.881%No
CVE-2025-21240High8.881%No
CVE-2025-21243High8.881%No
CVE-2025-21244High8.881%No
CVE-2025-21245High8.881%No
CVE-2025-21246High8.881%No
CVE-2025-21250High8.881%No
CVE-2025-21252High8.881%No
CVE-2025-21266High8.881%No
CVE-2025-21273High8.881%No
CVE-2025-21282High8.881%No
CVE-2025-21286High8.881%No
CVE-2025-21302High8.881%No
CVE-2025-21303High8.881%No
CVE-2025-21305High8.881%No
CVE-2025-21306High8.881%No
CVE-2025-21339High8.881%No
CVE-2025-21409High8.881%No
CVE-2025-21411High8.881%No
CVE-2025-21413High8.881%No
CVE-2025-21417High8.881%No
CVE-2025-21294High8.181%No
CVE-2025-21287High7.881%No
CVE-2025-21338High7.881%No
CVE-2025-21220High7.581%No
CVE-2025-21230High7.581%No
CVE-2025-21231High7.581%No
CVE-2025-21251High7.581%No
CVE-2025-21270High7.581%No
CVE-2025-21276High7.581%No
CVE-2025-21277High7.581%No
CVE-2025-21285High7.581%No
CVE-2025-21289High7.581%No
CVE-2025-21290High7.581%No
CVE-2025-21300High7.581%No
CVE-2025-21389High7.581%No
CVE-2025-21331High7.381%No
CVE-2025-21226Medium6.681%No
CVE-2025-21227Medium6.681%No
CVE-2025-21228Medium6.681%No
CVE-2025-21232Medium6.681%No
CVE-2025-21249Medium6.681%No
CVE-2025-21255Medium6.681%No
CVE-2025-21256Medium6.681%No
CVE-2025-21258Medium6.681%No
CVE-2025-21260Medium6.681%No
CVE-2025-21261Medium6.681%No
CVE-2025-21263Medium6.681%No
CVE-2025-21265Medium6.681%No
CVE-2025-21310Medium6.681%No
CVE-2025-21324Medium6.681%No
CVE-2025-21327Medium6.681%No
CVE-2025-21341Medium6.681%No
CVE-2025-21217Medium6.581%No
CVE-2025-21272Medium6.581%No
CVE-2025-21288Medium6.581%No
CVE-2025-21336Medium5.681%No
CVE-2025-21320Medium5.581%No
CVE-2025-21215Medium4.681%No

Scope and sources

Affected products
Also released in January 2025

KB5049981

121 CVEs · Critical · exploited

KB5049984

128 CVEs · Critical · exploited

KB5050009

128 CVEs · Critical · exploited

KB5050021

121 CVEs · Critical · exploited

KB5049983

122 CVEs · Critical

KB5049993

112 CVEs · Critical

KB5050004

93 CVEs · Critical

KB5050006

71 CVEs · Critical

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5050063 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.