Cisco IOS 12.2E, 12.2F, and 12.2S places a "no login" line into the VTY configuration when an administrator makes certain changes to a (1) VTY/AUX or (2) CONSOLE setting on a device without AAA enabled, which allows remote attackers to bypass authentication and obtain a terminal session, a different vulnerability than CVE-1999-0293 and CVE-2005-2105.
CVSS Severity (version 2.0):
Impact Subscore: 6.4
Exploitability Subscore: 3.2
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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20070829 VTY Authentication Bypass Vulnerability
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Vulnerable software and versions