CVE-2026-67303
FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 1, 2026
- Updated
- Aug 3, 2026
- Reserved
- Jul 29, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-617 Reachable Assertion
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- GitHub Security Advisory (GHSA-pfxq-3qmw-8vjx)vendor-advisory
- Patch Commitpatch
- Patch Commitpatch
- VulnCheck Advisory: FreeRDP before 3.29.0 Denial of Service via serial DeviceControlthird-party-advisory
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