Division by zero in FreeRDP - #VU152400
Published: September 28, 2026
Vulnerability identifier: #VU152400
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-369
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to divide by zero in the freerdp-shadow-cli shadow frame encoder when processing a client-supplied Frame Acknowledge PDU. A remote user can send a Frame Acknowledge PDU containing a frame ID greater than the server-sent frame ID to cause a denial of service.
The server provides frame IDs in Surface Frame Marker PDUs, making the required acknowledgment value deterministic.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.32.0