A vulnerability has been identified in PCS neo (Administration Console) (All versions < V3.1), TIA Portal (V15, V15.1 and V16). Manipulating certain files in specific folders could allow a local attacker to execute code with SYSTEM privileges. The security vulnerability could be exploited by an attacker with a valid account and limited access rights on the system.
https://www.kb.cert.org/vuls/id/466044
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-05
https://cert-portal.siemens.com/productcert/pdf/ssa-428051.pdf