A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-25666
• https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-040-07