CVE-2021-23270

HIGH 7.5CVE-2021-23270 · Published 12/04/2021 · updated 17/06/2026

In short

CVE-2021-23270 is a HIGH (CVSS 7.5) vulnerability affecting gargoyle (gargoyle-router).
Chance of exploitation in the next 30 days (EPSS): 1.0%, higher than 64.0% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
gargoyle gargoyle-router	`= 1.12.0`	No fix yet

Description

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.

References

ericpaulbishop/gargoyle commit 24afe94 · Patch

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