Cisco has released a new update designed to patch vulnerabilities in their network devices. According to Cisco this hole can allow an attacker to create a denial of service on the routers and switches. This vulnerability particularly concerns the Cisco Firewall Services Module (FWSM) for Cisco catalyst 6500 and Cisco router 7600 series.
The vulnerability exists in the Firewall Services Module. By sending specially crafted ICMP messages to the Firewall Services Module, an attacker can cause a denial-of-service condition.
So take a look at all security advisories and apply any necessary updates or workarounds to help mitigate the risks.
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