CVE-2022-27640

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-20 · updated 2026-06-17
Weakness: CWE-400

Description

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

How to fix

Upgrade to a fixed version: Siemens Simatic Cp 442-1 Rna Firmware 1.5.18; Siemens Simatic Cp 443-1 Rna Firmware 1.5.18. Check the vendor advisory for mitigations.

References

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