CVE-2026-39453

Navigating to a certain URL on the switch’s web server causes the switch to reboot

Risk score: 54/100
CVSS: 8.3 v3.1
Exploit chance (30 days): 0.3%
Published: 9 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is: 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: See advisory
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Yellow

CVSS 8.3 high

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

Original 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.

Last activity 9 Oct 2026. Patch Forecast updates every hour.