Widely deployed OS networking component; exploitation could disrupt enterprise networks across industries.
CVE-2026-33827
Race condition in Windows TCP/IP enables remote code execution over network.
Is CVE-2026-33827 being exploited?
Not confirmed. CVE-2026-33827 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.84% probability of exploitation in the next 30 days.
How severe is CVE-2026-33827?
CVE-2026-33827 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-33827?
Yes. A fix has been recorded for CVE-2026-33827. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What should I do about CVE-2026-33827?
Plan OS updates; monitor indicators; apply patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted network traffic exploiting TCP/IP race condition.
Patch when possible
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.19044.0 and < 10.0.19044.7184
- affected>= 10.0.19045.0 and < 10.0.19045.7184
- affected>= 10.0.22631.0 and < 10.0.22631.6936
- affected>= 10.0.22631.0 and < 10.0.22631.6936
- affected>= 10.0.26100.0 and < 10.0.26100.8246
- affected>= 10.0.26200.0 and < 10.0.26200.8246
- affected>= 10.0.28000.0 and < 10.0.28000.1836
- affected>= 6.2.9200.0 and < 6.2.9200.26026
- affected>= 6.3.9600.0 and < 6.3.9600.23132
- affected>= 6.3.9600.0 and < 6.3.9600.23132
- affected>= 6.2.9200.0 and < 6.2.9200.26026
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.20348.0 and < 10.0.20348.5020
- affected>= 10.0.25398.0 and < 10.0.25398.2274
- affected>= 10.0.26100.0 and < 10.0.26100.32690
- affected>= 10.0.26100.0 and < 10.0.26100.32690
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.