Cisco patches up to prevent denial of service attacks

A flaw in the Firewall Services Module could be used for denial of service attacks.

Cisco has released an update that addresses a vulnerability in a series of switches and routers.

The flaw is in the Firewall Services Module (FWSM) for its Catalyst 6500 series switches and 7600 series routers.

An attacker could have caused a denial of service (DoS) attack if they sent "specially crafted ICMP" messages to the Firewall Services Module, Cisco said.

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Cisco said it had not yet seen any cases of the flaw being exploited, but had observed data streams that had triggered it by accident.

The US-CERT (United States Computer Emergency Readiness Team) encouraged users and administrators to review the advisory and apply the necessary updates and workarounds.

This new flaw follows a separate patch the networking company released on Wednesday for its IOS XR software, used on some of its routers.

This could have led to routing inconsistencies and denial-of-service.

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