Cisco has warned customers of a flaw in its IOS network infrastructure software.
The flaw affects IOS 9.x, 10.x, 11.x, 12.x, R11.x and R12.x and could be used to launch a denial of service attack against a company's routers. The flaw is not considered critical.
In order for the flaw to work the software has to be configured for border gateway protocol (BGP) traffic, which is not the default setting.
In addition, a specially crafted BGP packet would have to come from a device already recognised as a trusted partner.
"Successful exploitation of this vulnerability results in a reload of the device. Repeated exploitation could result in a sustained DoS attack," warned Cisco in a statement.
The vendor said that it has made free software available to address the problem.
Danish security specialist Secunia first alerted Cisco to the vulnerability.
"The vulnerability is 'less critical' as several factors have to be in place before the vulnerability could be triggered," said Niels Henrik Rasmussen, chief executive at Secunia, in a statement.
Full details and a workaround can be found here.
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