CVE-2021-23270: Gargoyle-Router Gargoyle

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

In Gargoyle OS 1.12.0, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

Affected products

Published 2021-04-12. Last modified 2026-06-17.