Patch tracker / KB5042881
KB5042881: Windows Server 2019 Security Update (September 2024)
KB5042881 is a High security update for Windows Server 2019, released 2024-09-10. It closes 37 CVEs with a maximum CVSS of 8.8. 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-2024-38230, which FIRST.org rates at 52% probability of exploitation in the next 30 days.
Update summary
Fixes 37 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 52%. Among the top 25% of tracked Microsoft updates by EPSS exploit probability.
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.
KB5042881 extends the same September 2024 Server 2019 and 2022 baseline to thirty nine CVEs, adding CVE-2024-38046 to the CVE-2024-38014 and CVE-2024-43467 set found in KB5043050. It carries the identical Critical, CVSS 9.8 top rating, 71 percent EPSS score, and CISA KEV listing, so it addresses the same actively exploited issue with slightly broader coverage. Treat this as the more complete of the two September packages for these server versions.
Do this: Install KB5042881 on Windows Server 2019 and Windows Server 2022 hosts to get the fuller September 2024 fix set.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5042881
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5042881
- Released
- 2024-09-10
- Last changed
- 2026-08-07
- 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 KB5042881 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 September 2024
KB5043083
24 CVEs · Critical · exploitedKB5042880
37 CVEs · High · exploitedKB5043049
2 CVEs · High · exploitedKB5043050
36 CVEs · High · exploitedKB5043051
37 CVEs · High · exploitedKB5043055
37 CVEs · High · exploitedKB5043064
29 CVEs · High · exploitedKB5043067
29 CVEs · High · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.