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Vulnerability record · CVE-2020-37216 · published 3 April 2026

CVE-2020-37216: Improper input validation vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.92% · top 41.3% CWE-20 · Improper input validation Awaiting Analysis
8.7CVSS 4.0 base score
0.92%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2020-37216), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.