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Research > Zero-Day Tracker > 20131122

Cisco IOS ICMP Denial of Service Vulnerability

Date Disclosed:

Date Patched:
Patch Not Yet Available


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

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.


Code Execution:

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. 

No mitigations are currently available. 

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

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


2013-11-22 - Public disclosure.

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