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Cisco IOS ICMP Denial of Service Vulnerability

Disclosed November 22, 2013    Zeroday : 687 days

Vulnerability Description:

A vulnerability exists within IOS that allows a remote, unauthenticated attacker to cause a denial of service condition to arise via maliciously crafted ICMP packets. This may cause IPSec tunnels to fail.



Vulnerable Software/Devices:

Cisco IOS 15.2M and 15.2(4)M, earlier versions may be affected as well

Vulnerability Severity:


Exploit Availability:

No Exploit Available

Exploit Impact:

Denial of Service
Remote, unauthenticated attackers can send specially crafted ICMP packets which will change the already-configured MTU value of the tunnel interface. This will cause IPSec tunnels on the affected system to drop, thereby becoming unusable.

BeyondTrust Prevention and Detection:

BeyondTrust's Retina® Network Security Scanner scans devices to detect for this vulnerability.

  • 31618 - Cisco IOS Denial of Service Vulnerability (20131122) (Zero-Day)


No mitigations are currently available.