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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (58.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Belden Hirschmann Hios — versions >= 08.1.00, >= 07.1.01, 05.00.00
Weakness classification (CWE)
References
- assets.belden.com/m/3d3e2cbfa4860258/original/Belden-Security-Bulletin-BSECV-20… (vendor-advisory)
- www.vulncheck.com/advisories/hirschmann-hios-ethernet-ip-stack-denial-of-service (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.