Description
Siemens SINAMICS S/G controllers with firmware before 4.6.11 do not require authentication for FTP and TELNET sessions, which allows remote attackers to bypass intended access restrictions via TCP traffic to port (1) 21 or (2) 23.
Advisories 1
- ICSA-13-338-01 Siemens SINAMICS S/G Authentication Bypass Vulnerability CISA ICS & IT advisories · Jun 6, 2025