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Cisco IOS SIP Multiple Denial of Service Vulnerabilities

Devices running Cisco IOS with SIP enabled are prone to multiple denial-of-service vulnerabilities.

These issues are tracked by the following Cisco bug IDs and CVEs:

CSCse56800 (CVE-2008-3799)
CSCsg91306 (CVE-2008-3800)
CSCsl62609 (CVE-2008-3801)
CSCsk42759 (CVE-2008-3802)

An attacker can exploit these issues to deny service to legitimate users.