Patch tracker / CVE reference / CVE-2026-33827
CVE-2026-33827
Updated July 21, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 11 Microsoft security updates.
All about CVE-2026-33827: the Senserva AI read, whether it is exploited, the official patches, its change history, and the questions admins ask.
CVE-2026-33827 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 64%. Microsoft has shipped the fix: deploy one of the 11 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
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Senserva AI Opinion for CVE-2026-33827
Another Critical CVSS 9.8 hole in the Windows TCP/IP stack on Windows 10 1809 and Server 2019, this one with a 64 percent EPSS score. Like its sibling CVE-2026-40415, it sits below every application and firewall rule that only filters by port, so exposure is defined by network reachability alone. Two stack bugs at once raises the chance that public exploit tooling covers both.
Do this: Bundle this with the CVE-2026-40415 patching effort and verify perimeter and segmentation rules limit which 1809 and Server 2019 hosts accept traffic from untrusted networks.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-33827
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-33827
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
Exploitation and severity
Not in the CISA KEV catalog. EPSS exploit probability 64%. CVSS 9.8 (Critical).
This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-33827
High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5082052, KB5082060, KB5082063, KB5082123, KB5082126, KB5082127, KB5082142, KB5082198, KB5082200, KB5083768, KB5083769 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-2026-33827. 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.
Affected products
Common questions about CVE-2026-33827
Is CVE-2026-33827 actively exploited?
It is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score puts the probability of exploitation in the next 30 days at 64%.
What patch fixes CVE-2026-33827?
Microsoft fixed CVE-2026-33827 in KB5082052, KB5082060, KB5082063, KB5082123, KB5082126, KB5082127, KB5082142, KB5082198, KB5082200, KB5083768, KB5083769. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.
Which products are affected by CVE-2026-33827?
Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows Server 2019.
Can I ask my own AI about CVE-2026-33827?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-33827's key facts: severity, CVSS, EPSS exploit probability, CISA KEV status, and the fixing KB. Copy it into Claude, ChatGPT, or Copilot for a triage plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).
Fixed by the same updates
If you are patching CVE-2026-33827, the same updates also fix these:
Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.
