Cisco IOS after 12.3(14)T, 12.3(8)YC1, 12.3(8)YG, and 12.4, with voice support and without Session Initiated Protocol (SIP) configured, allows remote attackers to cause a denial of service (crash) by sending a crafted packet to port 5060/UDP.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
References to Advisories, Solutions, and Tools
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US-CERT Vulnerability Note:
20070131 SIP Packet Reloads IOS Devices Not Configured for SIP
Advisory; Patch Information
References to Check Content