Patch tracker / KB5070879

KB5070879: Windows Server 2019 Security Update (October 2025)

KB5070879 is a Critical security update for Windows Server 2019, released 2025-10-14. It closes 1 CVE 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-2025-59287, which FIRST.org rates at 100% probability of exploitation in the next 30 days.

Update summary

CriticalCISA KEV
2025-10-14
Released
1
CVEs fixed
9.8
Max CVSS
Critical
Severity
Deploy now
This update fixes vulnerability confirmed exploited in the wild.

Fixes 1 CVE. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 100%. Among the top 5% 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 Server 2019 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 KB5070879Microsoft support article
Senserva AI Opinion for KB5070879

KB5070879 patches CVE-2025-59287 on Windows Server 2019 and 2022, a Critical flaw rated CVSS 9.8 with an EPSS of 100 percent, meaning exploitation is effectively certain. It is already listed in the CISA KEV catalog, so attackers are using it in the wild against exposed servers, though it is not currently tied to ransomware campaigns.

Do this: Deploy KB5070879 to all Windows Server 2019 and 2022 hosts immediately, prioritizing internet-facing and domain-critical servers.

AI-generated from public data, 2026-07-27. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5070879

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

Full tracking and change history for KB5070879

Released
2025-10-14
Last changed
2025-10-14
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 KB5070879 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-2025-59287Critical9.8100%KEV

Scope and sources

Affected products
Also released in October 2025

KB5070881

1 CVE · Critical · exploited

KB5070882

1 CVE · Critical · exploited

KB5070883

1 CVE · Critical · exploited

KB5070884

1 CVE · Critical · exploited

KB5070886

1 CVE · Critical · exploited

KB5070887

1 CVE · Critical · exploited

KB5070892

1 CVE · Critical · exploited

KB5070893

1 CVE · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5070879 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.