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CVE-2026-33827

HighPublished

Windows TCP/IP Remote Code Execution Vulnerability

Published: Apr 14, 2026
Updated: Aug 14, 2026
Assigning CNA: microsoft
Evidence observed: Aug 25, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 55.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an unauthorized attacker to execute code over a network.

Sources

CVE-2026-33827Research
Technical analysis of CVE-2026-33827, a critical Windows TCP/IP RCE via race condition in IPv6/IPSec, including exploitation techniques, mitigation steps, and detection guidance.

Responsible use

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