High 7.5Published Apr 3, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:10 AM ET)

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Every CVE for Belden Hirschmann HiOS

Exploited in the last 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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Belden Hirschmann HiOS belden:hirschmann_hios (from the name)	from 08.1.00 not affected; from 07.1.01 not affected; from 05.00.00 through 08.0.00	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.