Vulnerabilities
CVE‑2026‑83780: Windows CCFFilter Driver Remote Code Execution via Use‑After‑Free
Microsoft has disclosed a remote code execution flaw in the CCFFilter driver (CVE‑2026‑83780). The vulnerability, triggered by a use‑after‑free condition, can be exploited over the network by an unauthenticated attacker. Defenders should apply the latest security update, disable the driver on vulnerable systems, and enforce network segmentation.
What happened
Microsoft identified a use‑after‑free bug in the CCFFilter driver that allows an unauthenticated attacker to execute arbitrary code remotely. The flaw is triggered when the driver processes malformed or malicious input over a network connection.
Impact
Any Windows system running the CCFFilter driver is potentially vulnerable. Successful exploitation grants the attacker full control over the affected machine, enabling lateral movement, data exfiltration, or persistence.
Mitigation
- Install the latest cumulative update that addresses CVE‑2026‑83780.
- On systems where the driver cannot be patched immediately, disable the CCFFilter driver via Group Policy or registry edits.
- Apply network segmentation and restrict inbound traffic to the ports used by the driver.
Detection
Monitor for anomalous driver activity, unexpected network connections to the CCFFilter service, and signs of memory corruption or crashes. Correlate with known indicators of exploitation attempts in Microsoft’s security advisories.
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