An authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.
https://www.softether.org/9-about/News/904-SEVPN202301
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1755