CVE-2020-37216 HIGH

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

Vendor Belden
Product Hirschmann HiOS
Weakness CWE-20 · Input validation
Published April 3, 2026
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
May 14, 2026 Record updated