A vulnerability has been identified in SIMATIC CP 1543-1 (All versions < V2.0.28), SIPLUS NET CP 1543-1 (All versions < V2.0.28). Under special conditions it was possible to write SNMP variables on port 161/udp which should be read-only and should only be configured with TIA-Portal. A write to these variables could reduce the availability or cause a denial-of-service.
https://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
https://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf