"Successful exploitation of the vulnerability on Cisco IOS may result in a reload of the device or execution of arbitrary code," Cisco said in its advisory. "Repeated exploitation could result in a sustained (denial of service) attack or execution of arbitrary code."
The vulnerability doesn't affect all versions of IOS, according to Cisco, and the Firewall Authentication Proxy for FTP and Telnet Sessions have to be in use. Nevertheless, this remains a deeply worrying security threat to the Internet, thus the increase in Internet threat level by Symantec.
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