Denial of Service Vulnerability in HMS Networks Switches
CVE-2026-39453

8.5HIGH

Key Information:

Vendor

Red Lion Controls

Status
700 Series
Vendor
CVE Published:
9 October 2026

What is CVE-2026-39453?

A specific URL on HMS Networks switches can be accessed, triggering an unintended reboot of the device. This vulnerability allows an attacker to create conditions for a Denial of Service (DoS), causing the switch to repeatedly reboot when exploited, potentially impacting network availability and services.

Affected Version(s)

700 Series 0

700 Series 0

700 Series 3.11.1

References

https://www.hms-networks.com/
https://www.hms-networks.com/cybersecurity
https://www.cisa.gov/news-events/ics-advisories/icsa-26-2...

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Gabrianna (Ria) Milloway of Idaho National Laboratory reported this vulnerability to CISA.
.