Several IoT devices from the CHIYU Technology firm are vulnerable to a flaw that permits bypassing the telnet authentication process due to an overflow during the negotiation of the telnet protocol. Telnet authentication is bypassed by supplying a specially malformed request, and an attacker may force the remote telnet server to believe that the user has already authenticated. Several models are vulnerable, including BF-430, BF-431, BF-450M, and SEMAC with the most recent firmware versions.

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