What’s Vulnerable › Vulnerabilities

CVE-2020-37216: Hirschmann HiOS EtherNet/IP Stack Denial of Service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-07-24
• Weakness: CWE-20

Description

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 through 08.0.00 — fixed in 07.1.01, 08.1.00

How to fix

Upgrade to a fixed version: Belden Hirschmann HiOS 07.1.01, 08.1.00. Check the vendor advisory for mitigations.

References

• https://assets.belden.com/m/3d3e2cbfa4860258/original/Belden-Security-Bulletin-BSECV-2019-14.pdf
• https://www.vulncheck.com/advisories/hirschmann-hios-ethernet-ip-stack-denial-of-service

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