Reachable assertion in FreeRDP - #VU164451
Published: November 10, 2026
Vulnerability identifier: #VU164451
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service by aborting freerdp-shadow-cli and terminating all sessions served by that process.
The vulnerability exists due to incorrect stream-position tracking in FreeRDP's remdesk server channel read loop when handling messages exceeding its 4096-byte buffer with shorter declared PDU lengths. A remote user can send a 4100-byte remdesk message containing only zero bytes to trigger a reachable assertion that aborts the server in default builds.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0