Cisco Security Advisory: Cisco IOS Software TELNET Option Handling Vulnerability. A defect in multiple Cisco IOS software versions will cause a Cisco router to reload unexpectedly when the router is tested for security vulnerabilities by security scanning software programs. The defect can be exploited repeatedly to produce a consistent denial of service (DoS) attack. Vulnerable releases include 11.3AA, 12.0(2) up to and including 12.0(6), and 12.0(7).
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