Cisco IOS software 11.3 through 12.2 running on Cisco uBR7200 and uBR7100 series Universal Broadband Routers allows remote attackers to modify Data Over Cable Service Interface Specification (DOCSIS) settings via a DOCSIS file without a Message Integrity Check (MIC) signature, which is approved by the router.
https://exchange.xforce.ibmcloud.com/vulnerabilities/9368
http://www.cisco.com/warp/public/707/cmts-MD5-bypass-pub.shtml