CVE-2026-39453 PUBLISHED

Red Lion Controls N-Tron 700 Series Reachable Assertion

Assigner: icscert
Reserved: 08.04.2026 Published: 09.10.2026 Updated: 09.10.2026

Navigating to a certain URL on the switch’s web server causes the switch to reboot. This can be automated using a tool like curl to create DoS conditions where the switch constantly reboots.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
CVSS Score: 8.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H
CVSS Score: 8.5

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Red Lion Controls
Product	700 Series
Versions	Default: unaffected affected from 0 to Firmware Versions 3.11.0 (excl.) affected from 0 to Bootloader Versions 2.0.6.1 (excl.) Version 3.11.1 is unaffected

Solutions

Red Lion controls recommends the following upgrades for the N-Tron 700 Series:

Upgrade to firmware version 3.11.1 or greater
Configure or disable the SNMP communities
Disable access to the web GUI

The upgrade procedure document can be viewed here https://www.hms-networks.com/ .

The advisory issued by HMS Networks regarding these vulnerabilities can be viewed here https://www.hms-networks.com/cybersecurity .

Credits

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

References

Problem Types

CWE-617 CWE