CVE-2022-27640: Siemens SIMATIC CP 442-1 Rna Firmware

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC CP 442-1 RNA (All versions < V1.5.18), SIMATIC CP 443-1 RNA (All versions < V1.5.18). The affected devices improperly handles excessive ARP broadcast requests. This could allow an attacker to create a denial of service condition by performing ARP storming attacks, which can cause the device to reboot.

Affected products

• Siemens SIMATIC CP 442-1 Rna Firmware: before 1.5.18 (fixed in 1.5.18)
• Siemens SIMATIC CP 443-1 Rna Firmware: before 1.5.18 (fixed in 1.5.18)

Published 2022-05-20. Last modified 2026-06-17.