FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a clientโside heap buffer overflow, causing a crash (DoS) and potential heap corruption with codeโexecution
VulnCheck: FreeRDP is
Exploit
CVE-2026-23533
VulnCheck
Update to v3.21.0