CVE-2021-42073

CVE-2021-42073 is a high-severity vulnerability affecting Barrier versions prior to 2.4.0. An unauthenticated attacker can exploit this by guessing a valid client label, which is often "Unnamed" or derivable from public information, to enter an active session with the Barrier server. This allows the attacker to capture input device events and modify the server's clipboard content. The vulnerability has a CVSS score of 8.2 (High) due to its network-based attack vector, low complexity, and high impact on confidentiality and low impact on integrity. There is currently no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.