CVE-2026-33272

Red Lion Controls N-Tron 700 Series Authentication Bypass Using an Alternate Path or Channel

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

A malicious user with physical access to the device can boot the switch from factory settings without authentication, use the default administrative credentials to obtain administrative access, and save changes to the configuration file so that they persist next time the switch boots normally.

Metrics

CVSS Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
CVSS Score: 4.9

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

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N
CVSS Score: 6.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Physical	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	None	Availability	None
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

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-288 CWE