A buffer overflow occurs in utilities/ymodem/ry_sy.c in RT-Thread through 5.0.2 because of an incorrect sprintf call or a missing '\0' character.
https://security.humanativaspa.it/multiple-vulnerabilities-in-rt-thread-rtos/
https://seclists.org/fulldisclosure/2024/Mar/28
https://github.com/hnsecurity/vulns/blob/main/HNS-2024-05-rt-thread.txt