Patch tracker / CVE reference / CVE-2026-35424

CVE-2026-35424

CVE-2026-35424 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.5 (High). 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
7.5
CVSS v3
2.3%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 2.3%. CVSS 7.5 (High).

This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-35424

CVE-2026-35424 is a Denial of Service flaw in the Windows IKE protocol implementation, rated Critical at CVSS 9.8, affecting Windows 10 Version 1809 and Windows Server 2019. It is not in CISA KEV and has no known ransomware use, but its 80 percent EPSS score signals that reliable exploitation is likely imminent. IKE runs in support of IPsec VPN and tunnel endpoints, so exposed servers accepting IKE traffic are the primary risk here.

Do this: Patch Windows Server 2019 and Windows 10 1809 hosts now, prioritizing any systems terminating IPsec or IKE VPN traffic on internet-facing interfaces.

AI-generated from public data, 2026-07-26. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-35424

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

Schedule normally
No exploitation observed as of 2026-10-14: not in the CISA KEV catalog, EPSS 2%.
Fixed by KB5087420 and 15 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Official patch(es) for CVE-2026-35424

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5087420, KB5087423, KB5087424, KB5087470, KB5087471, KB5087537, KB5087538, KB5087539, KB5087541, KB5087544, KB5087545, KB5089466, KB5089548, KB5089549, KB5093998, KB5094127 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-2026-35424. 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.

KB5087420KB5087423KB5087424KB5087470KB5087471KB5087537KB5087538KB5087539KB5087541KB5087544KB5087545KB5089466KB5089548KB5089549KB5093998KB5094127

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-54518CVE-2026-41089CVE-2026-41096CVE-2026-44815CVE-2026-45657CVE-2026-47291CVE-2026-42904CVE-2025-10263
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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