Cisco IOS and IOS XE Software Cluster Management Protocol Vulnerability

Number: AL17-002
Date: 20 March 2017


The purpose of this alert is to bring attention to a recently disclosed vulnerability in Cisco’s IOS and IOS XE Software Cluster Management Protocol (CMP).


CCIRC is aware of a recently disclosed vulnerability in Cisco’s IOS and IOS XE Software CMP.  Identified as CVE-2017-3881, this vulnerability code can allow a remote unauthenticated attacker to cause a reload of the affected system or to remotely execute code. 

The vulnerability could be successfully exploited by sending malformed CMP-specific Telnet options while establishing a Telnet session with a CISCO device configured to accept Telnet connections.

There are over 300 models of Cisco switches that may be affected by this vulnerability. For an extensive list of devices please visit the vendor’s Advisory (listed below).

Suggested Action

Due to the potential risk presented by this vulnerability, CCIRC recommends that system administrators monitor for the developer released security fix. Additional mitigation advise has been published by the vendor.


Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

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