CVE-2026-67303

MEDIUM

FreeRDP before 3.29.0 Denial of Service via serial DeviceControl

Title source: cna
STIX 2.1

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).

References (4)

Core 4
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-pfxq-3qmw-8vjx)
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pfxq-3qmw-8vjx
Third Party Advisory third-party-advisory
VulnCheck Advisory: FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
https://www.vulncheck.com/advisories/freerdp-before-denial-of-service-via-serial-devicecontrol

Scores

CVSS v3 4.3
EPSS 0.0025
EPSS Percentile 16.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-617
Status published
Products (2)
FreeRDP/FreeRDP < 3.29.0
FreeRDP/FreeRDP 3.29.0
Published Aug 01, 2026
Tracked Since Aug 01, 2026