Patch tracker / KB5065435

KB5065435: Windows Server 2019 Security Update (September 2025)

KB5065435 is a Medium security update for Windows Server 2019, released 2025-09-09. It closes 2 CVEs with a maximum CVSS of 4.3. The most likely of them to be attacked is CVE-2025-54107, which FIRST.org rates at 20% probability of exploitation in the next 30 days.

Update summary

Medium
2025-09-09
Released
2
CVEs fixed
4.3
Max CVSS
Medium
Severity
Deploy this cycle
Fixes 2 CVEs for Windows Server 2019. No confirmed in-the-wild exploitation in this set today.

Fixes 2 CVEs. Most severe CVSS 4.3 (Medium). EPSS exploit probability up to <1%. Among the lower half 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 KB5065435Microsoft support article
Senserva AI Opinion for KB5065435

KB5065435 is the September 9, 2025 update for Windows 10 Version 1809 and Windows Server 2019, fixing two CVEs (CVE-2025-54107 and CVE-2025-54917) that top out at Medium Severity with CVSS 4.3 and only 1% EPSS. Neither CVE is in the CISA KEV catalog or tied to ransomware, so the risk driver here is keeping an older, still supported servicing branch current rather than any active exploitation. Shops running Server 2019 or the 1809 client are the exposed group, and these tend to be legacy or slow-to-patch environments.

Do this: Approve and deploy KB5065435 to your remaining Windows 10 1809 and Server 2019 hosts during the standard September patch window.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5065435

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

Full tracking and change history for KB5065435

Released
2025-09-09
Last changed
2025-09-09
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 KB5065435 is installed

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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-2025-54107High8.820%No
CVE-2025-54917High8.820%No

Scope and sources

Affected products
Also released in September 2025

KB5002775

3 CVEs · High

KB5002778

3 CVEs · High

KB5002784

1 CVE · High

KB5065220

2 CVEs · High

KB5065221

2 CVEs · High

KB5065222

3 CVEs · High

KB5065223

3 CVEs · High

KB5065224

3 CVEs · High

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5065435 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.