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Disable Telnet On Vulnerable Models — Patch is not Available Yet! The vulnerability affects 264 Catalyst switches, 51 industrial Ethernet switches, and 3 other devices, which includes Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2/3 EtherSwitch Service Module, Enhanced Layer 2 EtherSwitch Service Module, ME 4924-10GE switch, IE Industrial Ethernet switches, RF Gateway 10, SM-X Layer 2/3 EtherSwitch Service Module, and Gigabit Ethernet Switch Module (CGESM) for HP. (check complete list here) Currently, this vulnerability is unpatched, and until patches are available, Cisco recommends its users to disable the Telnet connection to the switch devices in favor of SSH. The company's advisory doesn't talk about any working exploit using this flaw, but if there's one, tens of thousands, if not hundreds of thousands, of devices installed around the world look to have been at great risk for an unknown period — Thanks to the CIA for holding the flaw. Cisco will update its IOS Software Checker tool immediately as soon as the patches come out.
VPN - Virtual Privacy Network