CVE-2026-67303CWE-617

CVE-2026-67303

Medium · published August 1, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
35.0
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00418 · 35.0th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2026-08-01T17:16Z
Affected products (1)
ProductVersionsFixed in
freerdp/freerdp< 3.29.03.29.0
References (4)
https://github.com/FreeRDP/FreeRDP/commit/1cc783d4c78bd2f66d3a8582dfe70a663d141444 · [email protected]https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f · [email protected]https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-pfxq-3qmw-8vjx · [email protected]https://www.vulncheck.com/advisories/freerdp-before-denial-of-service-via-serial-devicecontrol · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    FreeRDP before 3.29.0 Denial of Service via serial DeviceControl
    cvelistv5