Cisco VACM (View-based Access Control MIB) for Catalyst Operating Software (CatOS) 5.5 and 6.1 and IOS 12.0 and 12.1 allows remote attackers to read and modify device configuration via the read-write community string.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6179
http://www.securityfocus.com/bid/5030
http://www.kb.cert.org/vuls/id/645400
http://www.cisco.com/warp/public/707/ios-snmp-community-vulns-pub.shtml