Denial of Service in Hirschmann HiOS EtherNet/IP Stack

Publication date: 2026-04-03

Last updated on: 2026-04-03

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-03

Last Modified

2026-04-03

Generated

2026-07-06

AI Q&A

2026-04-04

EPSS Evaluated

2026-07-05

NVD

CVE-2020-37216

Affected Vendors & Products

Vendor	Product	Version / Range
hirschmann	hios	to 08.1.00 (exc)
hirschmann	hios	to 07.1.01 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This vulnerability affects Hirschmann HiOS devices running versions prior to 08.1.00 and 07.1.01. It is a denial of service (DoS) issue in the EtherNet/IP stack caused by improper handling of packet length fields.

Remote attackers can exploit this by sending specially crafted UDP EtherNet/IP packets where the length value is larger than the actual packet size. This causes the device to crash or hang, rendering it inoperable.

Impact Analysis

The vulnerability can cause affected Hirschmann HiOS devices to crash or become unresponsive when they receive maliciously crafted packets. This results in a denial of service, potentially disrupting network operations and device availability.

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