Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities
At a glance
Severity
MEDIUM 5.8
EPSS
EPSS 0.58 % · percentile 47 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
cisco
NVD status
Awaiting Analysis
Description
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.
