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CVE-2026-83780 Microsoft CVE debrief

A critical vulnerability exists in the Windows CCFFilter Driver, allowing an unauthorized attacker to execute code over a network. This use-after-free vulnerability has a CVSS score of 9.8 and is classified as CRITICAL. The vulnerability affects multiple versions of Windows and Windows Server, including Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. Defenders responsible for these systems should assess exposure and apply patches as soon as possible to prevent potential disruption and data compromise. The CVE Program record and NVD vulnerability detail provide official information on the ...

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems should assess exposure and apply patches as soon as possible.

Why it matters

CVE-2026-83780 is a critical vulnerability in the Windows CCFFilter Driver that allows remote code execution. Defenders should assess exposure and apply patches immediately to prevent potential disruption and data compromise.

  • Potential remote code execution by unauthorized attackers
  • Possible disruption of critical services and data compromise
  • Need for immediate patching and verification of system configurations
  • Potential for lateral movement and exploitation of other vulnerabilities

Technical summary

The Windows CCFFilter Driver is vulnerable to a use-after-free vulnerability, allowing an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 9.8 and affects multiple versions of Windows and Windows Server, including Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. The vulnerability can be exploited by an attacker to execute arbitrary code, potentially leading to disruption of critical services and data compromise. Microsoft's advisory

Defensive priority

Immediate priority should be given to assessing exposure and applying patches for Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems.

Recommended defensive actions

  • Assess exposure of Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems
  • Apply patches from Microsoft as soon as possible
  • Verify system configurations and ensure compensating controls are in place
  • Monitor for suspicious activity related to the vulnerability

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. Microsoft's advisory is referenced as a supplemental source.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83780 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83780

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-83780 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83780

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.