What is CVE-2020-37216?

CVE-2020-37216 is a high-severity vulnerability in Belden Hirschmann Hios, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-04-03.

How severe is CVE-2020-37216?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Belden Hirschmann Hios

CVE-2020-37216

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.009 (56.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Belden Hirschmann Hios — versions >= 08.1.00, >= 07.1.01, 05.00.00

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2020-37216?: CVE-2020-37216 is a high-severity vulnerability in Belden Hirschmann Hios, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-04-03.
How severe is CVE-2020-37216?: High severity. CVSS v3 base score is 7.5 out of 10.