CVE-2017-14466

CVE-2017-14466 is a critical access control vulnerability affecting Allen Bradley Micrologix 1400 Series B PLCs with firmware FRN 21.2 and earlier. An unauthenticated attacker can send specially crafted packets to perform read or write operations, potentially leading to sensitive information disclosure, modification of settings, or alteration of ladder logic, including overwriting the master password. This vulnerability carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low complexity, and high impact on confidentiality, integrity, and availability. Despite its severity, there is no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.