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Cybersecurity watch

Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerability

Cisco Security Advisories

Why it matters

This page references a cybersecurity signal published by Cisco Security Advisories. It helps CISOs, DPOs, IT leaders, infrastructure teams, SMBs and enterprise accounts track vulnerabilities, alerts and trends that may affect security, compliance or system resilience.

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This signal should be mapped against the application inventory, internet exposure and patch-management process. The key point is not only the existence of a vulnerability, but how quickly the organization can verify whether it is affected.

Watch points

  • Presence of the product or component in the environment
  • External exposure or administrator access
  • Patch, workaround and maintenance window

Recommended action

Check exposure against the inventory, qualify whether the component is present, then decide quickly between patching, workaround or reinforced monitoring.

Relevant for

CISOs, IT leaders, infrastructure teams, operations and application owners.

Source summary

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...

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