CVE-2020-37216: Belden Hirschmann Hios

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Hirschmann HiOS devices versions prior to 08.1.00 and 07.1.01 contain a denial of service vulnerability in the EtherNet/IP stack where improper handling of packet length fields allows remote attackers to crash or hang the device. Attackers can send specially crafted UDP EtherNet/IP packets with a length value larger than the actual packet size to render the device inoperable.

Affected products

• Belden Hirschmann Hios: from 05.00.00, up to and including 08.0.00

Published 2026-04-03. Last modified 2026-07-24.