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Vulnerability record · CVE-2021-23270 · published 12 April 2021

CVE-2021-23270: Gargoyle-router gargoyle vulnerability

GGargoyle Router · Gargoyle

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.

7.5 CVSS 3.1 High EPSS 1.0% · top 37.6% CWE-834 · CWE-834
7.5CVSS 3.1 base score, v2 4.3
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ericpaulbishop/gargoyle/commit/24afe944a6ffff53d84a748384e276a4e95912ec PatchThird Party Advisory
https://github.com/ericpaulbishop/gargoyle/commit/24afe944a6ffff53d84a748384e276a4e95912ec PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2015-10145Gargoyle-router gargoyle os command injection vulnerabilityGargoyle router management utility versions 1.5.x contain an authenticated OS command execution vulnerability in /utility/run_commands.sh. The applic…EPSS 0.73%

Source: NIST National Vulnerability Database (record CVE-2021-23270), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.