CVE-2022-27640

Name: CVE-2022-27640
Creator: NVD / NIST
Published: 2022-05-20T13:15:15.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2022-27640 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.35%

27.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Simatic Cp 442-1 Rna Firmware	< 1.5.18
Siemens	Simatic Cp 443-1 Rna Firmware	< 1.5.18

References

https://cert-portal.siemens.com/productcert/pdf/ssa-480937.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-480937.pdfPatch, Vendor Advisory

Timeline

Published: May 20, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-27640?

How severe is CVE-2022-27640?

CVE-2022-27640 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2022-27640?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-27640?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST