CVE-2021-27342

CVE-2021-27342 describes an authentication bypass vulnerability in the telnetd service of D-Link DIR-842 routers, specifically firmware version 3.0.2. This flaw allows a remote attacker to bypass the brute-force protection mechanism's cool-down delay through a timing-based side-channel attack. Rated Medium (CVSS 5.9), the vulnerability has a network attack vector and high attack complexity, potentially leading to unauthorized access (integrity impact). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.