CVE-2026-67303: FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == BytesReturned)) in serial_process_irp_device_control() in channels/serial/client/serial_mai
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).
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-67303
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-67303 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for FreeRDP
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-67306: FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 pl…nvd · 2026-08-01
- unknownCVE-2026-67305: FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clip…nvd · 2026-08-01
- highCVE-2026-67304: FreeRDP before 3.29.0 contains a null pointer dereference vulnerability in smartcard device co…nvd · 2026-08-01
- mediumCVE-2026-67302: FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a divide-by-zero vulnerability in…nvd · 2026-08-01
- highCVE-2026-67301: FreeRDP before 3.29.0 contains out-of-bounds read vulnerabilities in the async update message …nvd · 2026-08-01
- highCVE-2026-67300: FreeRDP before 3.29.0 contains client-side heap use-after-free vulnerabilities in the async up…nvd · 2026-08-01
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