Patch tracker / CVE reference / CVE-2025-54099

CVE-2025-54099

CVE-2025-54099 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.0 (High). Its EPSS score puts the probability of exploitation in the next 30 days at 20%. Microsoft has shipped the fix: deploy one of the 16 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
7.0
CVSS v3
20%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 20%. CVSS 7.0 (High).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2025-54099

One more Ancillary Function Driver for WinSock elevation of privilege bug appears here, this time rated High at 8.8 with a 19 percent EPSS score, a meaningfully higher exploit probability than the other High-severity WinSock CVEs in this data, affecting Windows 10 version 1809 and Windows Server 2019. It brings the running total of separately disclosed AFD-related CVEs across this data set into the double digits. No confirmed exploitation or ransomware use.

Do this: Give this WinSock variant priority over the lower-EPSS AFD fixes when sequencing patches for Windows 10 1809 and Server 2019.

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

Senserva AI Opinion and rich prompt for CVE-2025-54099

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

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 20%).
Fixed by KB5065306 and 15 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2025-54099

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 KB5065306, KB5065425, KB5065426, KB5065427, KB5065428, KB5065429, KB5065430, KB5065431, KB5065432, KB5065468, KB5065474, KB5065507, KB5065508, KB5065509, KB5065510, KB5065511 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-2025-54099. 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.

KB5065306KB5065425KB5065426KB5065427KB5065428KB5065429KB5065430KB5065431KB5065432KB5065468KB5065474KB5065507KB5065508KB5065509KB5065510KB5065511

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-21293CVE-2025-54106CVE-2025-54110CVE-2025-54113CVE-2025-54918CVE-2025-55234CVE-2025-53800CVE-2025-53801
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See 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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