Remote code-execution in a Windows kernel driver affects widely deployed Microsoft OS; high-impact, enterprise-wide risk requiring urgent attention.
CVE-2026-83780
Remote code execution via use-after-free in Windows CCFFilter Driver.
Is CVE-2026-83780 being exploited?
Not confirmed. CVE-2026-83780 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.
How severe is CVE-2026-83780?
CVE-2026-83780 is rated Critical with a CVSS score of 9.8. 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-2026-83780?
Yes. A fix has been recorded for CVE-2026-83780. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-83780 affect?
CVE-2026-83780 affects Microsoft Windows - CCFFilter Driver. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-83780?
Install Microsoft's security update immediately; isolate vulnerable hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated code execution as SYSTEM over network via CCFFilter Driver use-after-free, enabling full system compromise.
Immediate action required
- affected>= 10.0.14393.0 and < 10.0.14393.9612
- affected>= 10.0.17763.0 and < 10.0.17763.9376
- affected>= 10.0.14393.0 and < 10.0.14393.9612
- affected>= 10.0.14393.0 and < 10.0.14393.9612
- affected>= 10.0.17763.0 and < 10.0.17763.9376
- affected>= 10.0.17763.0 and < 10.0.17763.9376
- affected>= 10.0.20348.0 and < 10.0.20348.5761
- affected>= 10.0.26100.0 and < 10.0.26100.33650
- affected>= 10.0.26100.0 and < 10.0.26100.33650
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.