🛡️ CVE-2026-67303

🟡 CVSS 4.3 — Medium ✅ No Known Exploit CWE-617 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Affected software

CVE-2026-67303 is recorded against 1 package.

  • unknown

Timeline and source

Published on 1 August 2026 and last revised on 3 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
github.com
www.vulncheck.com

Details

Severity MEDIUM
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CWE CWE-617
Public Exploit ✅ No
Source NVD
Published 2026-08-01
Updated 2026-08-11
Modified 2026-08-03
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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