CVE-2020-37216

Hirschmann HiOS EtherNet/IP Stack Denial of Service

State: Published
Severity: 8.7 High
Published: Apr 3, 2026
Updated: Jul 15, 2026
Reserved: Apr 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
Hirschmann HiOSBelden	>= 08.1.00Not affected >= 07.1.01Not affected 05.00.00 through 08.0.00Affected

References

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

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