Network equipment maker Cisco Systems Inc. is warning customers about security holes in its PIX firewall product and firewall software that runs on the Catalyst 6500 Series and 7600 Series switches. "Cisco issued two security advisories on Monday describing vulnerabilities that could allow remote attackers to shut down Cisco firewalls using HTTP (Hypertext Transfer Protocol) or SNMP (Simple Network Management Protocol) requests designed to exploit the weaknesses."

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