![]() To connect, the telnet service is used on port 23 with the default password of 059AnkJ for the root account. TX9 Automatic Food Dispenser v3.2.57 devices allow access to a shell as root/superuser, a related issue to CVE-2019-16734. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption. In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. In Contiki 3.0, a buffer overflow in the Telnet service allows remote attackers to cause a denial of service because the ls command is mishandled when a directory has many files with long names. In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected clients entering an infinite loop and waiting forever, which may cause excessive CPU consumption. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. ** UNSUPPORTED WHEN ASSIGNED ** D-Link DSR-500N version 1.02 contains hard-coded credentials for undocumented user accounts in the '/etc/passwd' file.If an attacker succeeds in recovering the cleartext password of the identified hash value, he will be able to log in via SSH or Telnet and thus gain access to the underlying embedded Linux operating system on the device. Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory. ![]() Specifically, a server sometimes sends no response, because a fixed buffer space is available for all responses and that space may have been exhausted. During negotiation between a server and a client, the server may fail to give the WILL/WONT or DO/DONT response for DO and WILL commands because of improper handling of exception condition, which leads to property violations and denial of service. In Contiki 3.0, Telnet option negotiation is mishandled. ![]()
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