Medium · published February 9, 2026
⚠️ A crafty NULL pointer dereference can crash your FreeRDP proxy! An attacker just needs to send a specific LogonInfoV2 PDU, and poof — downtime! 🔥 Think of it like a restaurant server who miswrites an order — an empty dish sent to the kitchen leads to confusion and a whole lot of wasted time. In this case, a malicious RDP server messes with FreeRDP's meal prep, causing an unexpected crash instead of a seamless connection. If exploited, this vulnerability could lead to a denial of service, leaving your FreeRDP proxy unable to serve any requests. While this might not leak sensitive data, your users would be left hanging, unable to connect when they need it most. Not ideal for business continuity!
Think of it like a restaurant server who miswrites an order — an empty dish sent to the kitchen leads to confusion and a whole lot of wasted time. In this case, a malicious RDP server messes with FreeRDP's meal prep, causing an unexpected crash instead of a seamless connection. This vulnerability in FreeRDP allows a NULL pointer dereference in the function rdp_write_logon_info_v2() when handling malformed LogonInfoV2 PDUs, enabling a malicious RDP server to crash the proxy before version 3.22.0.
If exploited, this vulnerability could lead to a denial of service, leaving your FreeRDP proxy unable to serve any requests. While this might not leak sensitive data, your users would be left hanging, unable to connect when they need it most. Not ideal for business continuity! Update your FreeRDP installation to version 3.22.0 or later to mitigate this risk. It's also a good idea to monitor any RDP connections and implement strict access controls to minimize potential exposure. Don't leave any openings! You've got this! Apply the patch, and you'll have your FreeRDP environment back in top shape in no time. 🛡️