CVE-2026-39453

HIGH 8.3

Red Lion Controls N-Tron 700 Series Reachable Assertion

CVSS Score

8.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-617
Vendor	red lion controls
Product	700 series
Published	Oct 9, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

High

Affected Versions

Red Lion Controls / 700 Series

0 < Firmware Versions 3.11.0 0 < Bootloader Versions 2.0.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hms-networks.com: https://www.hms-networks.com/ hms-networks.com: https://www.hms-networks.com/cybersecurity cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-281-01 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-281-01.json

Credits

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