CVE-2019-13945
A vulnerability has been identified in S7-1200 CPU (All versions). There is an access mode used during manufacturing of S7-1200 CPUs that allows additional diagnostic functionality. The security vulnerability could be exploited by an attacker with physical access to the UART interface during boot process. At the time of advisory publication no public exploitation of this security vulnerability was known.
Source: CVE-2019-13945