Patch tracker / CVE reference / CVE-2025-21254
CVE-2025-21254
CVE-2025-21254 is a medium severity Microsoft vulnerability with a CVSS score of 6.5. Its EPSS score puts the probability of exploitation in the next 30 days at 24%. Microsoft has shipped the fix: deploy one of the 9 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability 24%. CVSS 6.5 (Medium).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
This is a third Internet Connection Sharing denial of service issue in this batch, again scoped to Windows 10 1809 and Server 2019 with an identical 8.8 severity and 22 percent EPSS reading. The repetition across CVE IDs signals Microsoft found and fixed multiple distinct code paths in the same ICS component during the same review cycle. No exploitation or ransomware tie has been reported for it.
Do this: Roll all three ICS denial of service fixes into a single patch pass rather than tracking them one at a time.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-21254
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2025-21254
Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5051974, KB5051979, KB5051980, KB5051987, KB5051989, KB5052000, KB5052006, KB5052105, KB5052106 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security updates below to fix CVE-2025-21254. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.
Scope and sources
- Affected products
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.