What’s Vulnerable › Vulnerabilities

CVE-2026-39453: Red Lion Controls N-Tron 700 Series Reachable Assertion

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-11
• Weakness: CWE-617

Description

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.

Affected products

• Red Lion Controls 700 Series: before Firmware Versions 3.11.0; before Bootloader Versions 2.0.6.1 — fixed in Bootloader Versions 2.0.6.1, Firmware Versions 3.11.0

How to fix

Upgrade to a fixed version: Red Lion Controls 700 Series Bootloader Versions 2.0.6.1, Firmware Versions 3.11.0. Check the vendor advisory for mitigations.

References

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

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