CVE-2026-39453 Red Lion Controls N-Tron 700 Series Reachable Assertion
An attacker can cause a Red Lion Controls N-Tron switch to reboot by accessing a specific URL, resulting in a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39453?
CVE-2026-39453 is a high-severity denial of service vulnerability in Red Lion Controls 700 Series, published on 9 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-617
Which versions are affected by CVE-2026-39453?
How do I fix CVE-2026-39453?
No fix has been published for CVE-2026-39453 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-39453 being exploited?
There is no known exploitation of CVE-2026-39453 in the wild and no public exploit code.
Sources
Also known as GHSA-jp3p-vmv4-q5ff.