FreeRDP prior to version 2.0.0-rc4 contains an Out-Of-Bounds Write of up to 4 bytes in function nsc_rle_decode() that results in a memory corruption and possibly even a remote code execution.
https://usn.ubuntu.com/3845-2/
https://usn.ubuntu.com/3845-1/
https://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/
https://lists.debian.org/debian-lts-announce/2019/02/msg00015.html
https://github.com/FreeRDP/FreeRDP/commit/d1112c279bd1a327e8e4d0b5f371458bf2579659