In FreeRDP less than or equal to 2.0.0, there is an out-of-bound data read from memory in cleardecompresssubcode_rlex, visualized on screen as color. This has been patched in 2.1.0.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-11040.json"