CVE-2020-35370 (raysync)
A RCE vulnerability exists in Raysync below 3.3.3.8. An unauthenticated unauthorized attacker sending a specifically crafted request to override the specific file in server with malicious content can login as "admin", then to modify specific shell file to achieve remote code execution(RCE) on the hosting server.
Source: CVE-2020-35370 (raysync)