Patch tracker / KB5046398

KB5046398: Windows 11 version 21H2 Security Update (October 2024)

KB5046398 is a Medium security update for Windows 11 version 21H2, released 2024-10-08. It closes 1 CVE with a maximum CVSS of 6.4. The most likely of them to be attacked is CVE-2024-43513, which FIRST.org rates at 67% probability of exploitation in the next 30 days.

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Update summary

Medium
2024-10-08
Released
1
CVEs fixed
6.4
Max CVSS v3
Medium
Severity
Deploy this cycle
Fixes 1 CVE for Windows 11 version 21H2. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 6.4 (Medium). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Microsoft Update Catalog: download KB5046398Microsoft support article
Senserva AI Opinion for KB5046398

KB5046398 is a companion build fixing the same CVE-2024-43513 in Windows 10 1809 and Windows Server 2019, Medium severity at 6.4 CVSS. Its low severity means it can ride along with other scheduled updates for these legacy platforms rather than needing an expedited push.

Do this: Bundle KB5046398 with other routine updates for Windows 10 1809 and Windows Server 2019.

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

Senserva AI Opinion and rich prompt for KB5046398

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

Full tracking and change history for KB5046398

Released
2024-10-08
Last changed
2026-09-26
Changes tracked
2

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 KB5046398 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-2024-43513Critical9.067%No

Scope and sources

Affected products
Also released in October 2024

KB29166583

1 CVE · Critical · exploited

KB5044277

77 CVEs · Critical · exploited

KB5044281

65 CVEs · Critical · exploited

KB5044288

83 CVEs · Critical · exploited

KB5044293

56 CVEs · Critical · exploited

KB5044306

32 CVEs · Critical · exploited

KB5044320

32 CVEs · Critical · exploited

KB5044321

36 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5046398 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.
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