VULNERABILITY INTELLIGENCE

CVE-2026-67303

CVSS score4.3 MEDIUM
EPSS probability0.42%
CISA KEVNot currently listed
Published2026-08-01
Last modified2026-09-29
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Description

FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == BytesReturned)) in serial_process_irp_device_control() in channels/serial/client/serial_main.c. When serial device redirection is enabled and a server-controlled IRP_MJ_DEVICE_CONTROL request specifies an unsupported IOCTL with a non-zero OutputBufferLength, CommDeviceIoControl() can fail with BytesReturned = 0, causing the mismatch to trigger the assertion and abort the client process (denial of service).

Weakness classification

  • disclosure@vulncheck.com: CWE-617

Primary references