CVE-2026-20221

CVE-2026-20221 · Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities

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Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine. This vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required.

CVSS 5.8 · Moyenne · EPSS 0,6%

Publication

2026-10-21T16:12:53.435Z

Mise à jour

2026-10-22T19:11:26.546Z

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