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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

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CSCds04747

Vulnerability Assessment Summary Uses SNMP to determine if a flaw is present Detailed Explanation for this Vulnerability Assessment Cisco IOS Software contains a flaw that permits the successful prediction of TCP Initial Sequence Numbers. This vulnerability is present in all released versions of Cisco IOS software running on Cisco routers and switches. It only affects the security of TCP connections that originate or terminate on the affected Cisco device itself it does not apply to TCP traffic forwarded through the affected device in transit between two other hosts. This vulnerability is documented as Cisco bug ID CSCds04747. Solution : http://www.cisco.com/warp/public/707/ios-tcp-isn-random-pub.shtml Network Security Threat Level: Medium *** As Nessus solely relied on the banner of the remote host *** this might be a false positive Networks Security ID: 2682 Vulnerability Assessment Copyright: This script is (C) 2002 Renaud Deraison

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