CVE-2022-25219

A null byte interaction error has been discovered in the code that the telnetd_startup daemon uses to construct a pair of ephemeral passwords that allow a user to spawn a telnet service on the router, and to ensure that the telnet service persists upon reboot. By means of a crafted exchange of UDP packets, an unauthenticated attacker on the local network can leverage this null byte interaction error in such a way as to make those ephemeral passwords predictable (with 1-in-94 odds). Since the attacker must manipulate data processed by the OpenSSL function RSA_public_decrypt(), successful exploitation of this vulnerability depends on the use of an unpadded RSA cipher (CVE-2022-25218).

• https://www.tenable.com/security/research/tra-2022-01Exploit, Third Party Advisory
• https://www.tenable.com/security/research/tra-2022-01Exploit, Third Party Advisory

Published

Mar 10, 2022

Last Modified

Jun 17, 2026

Status

Modified

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