FreeRDP versions before 3.29.0 are vulnerable to TLS certificate validation bypasses, which could allow an attacker to intercept or manipulate encrypted RDP traffic.

This vulnerability involves improper certificate validation (CWE-295) in several TLS-related functions. An unauthenticated remote attacker can exploit these weaknesses to perform a man-in-the-middle attack by presenting a crafted certificate that the client incorrectly validates.

The ability to bypass TLS server authentication poses a severe risk to organizational confidentiality and integrity. A successful exploit allows an attacker to intercept sensitive data, including RDP credentials and session information, leading to unauthorized access to internal systems. With a CVSS score of 9.8, this flaw represents a critical risk to any environment relying on FreeRDP for secure remote connectivity.

Immediate Action: Update FreeRDP to version 3.29.0 or later to ensure proper TLS certificate validation logic is implemented.

Proactive Monitoring: Audit network traffic for suspicious RDP connection patterns and review authentication logs for anomalies that may suggest intercepted or proxied sessions.

Compensating Controls: Ensure all RDP connections are encapsulated within a VPN tunnel or a secondary secure transport layer to limit the impact of potential client-side validation failures.

Public Exploit Available: No (exploit_available: false)

Organizations using FreeRDP must prioritize patching to version 3.29.0 immediately. Given the critical nature of identity validation bypasses, delaying this update significantly increases the risk of successful interception of remote session traffic by malicious actors.