CVE-2026-67303

MediumCVSS 4.3/10Last modified Sep 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).

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-617

Affected software

Vendor	Product	Versions
FreeRDP	FreeRDP	< 3.29.0

References

https://github.com/FreeRDP/FreeRDP/commit/1cc783d4c78bd2f66d3a8582dfe70a663d141444Patch
https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493fPatch
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pfxq-3qmw-8vjxMitigation, Vendor Advisory
https://www.vulncheck.com/advisories/freerdp-before-denial-of-service-via-serial-devicecontrolPatch, Third Party Advisory

Timeline

Published: Aug 1, 2026
Last modified: Sep 29, 2026
NVD status: Analyzed

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