FreeRDP prior to version 2.0.0-rc4 contains a Heap-Based Buffer Overflow in function zgfx_decompress() that results in a memory corruption and probably even a remote code execution.
https://usn.ubuntu.com/3845-1/
https://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/
https://github.com/FreeRDP/FreeRDP/commit/602f4a2e14b41703b5f431de3154cd46a5750a2d