CVE-2026-67303

A flaw was found in FreeRDP. When serial device redirection is active, a malicious server can send a crafted device control request. If this request specifies an unsupported operation with a non-zero output buffer, it can cause the FreeRDP client process to unexpectedly terminate. This leads to a denial of service, preventing the client from maintaining its remote desktop connection.

This issue is classified as Moderate severity because exploitation requires serial device redirection to be active and a user connecting to a malicious server, where a crafted device control request triggers an application process crash resulting solely in a localized denial of service.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.