CVE-2017-9544

CVE-2017-9544 is a critical remote stack-based buffer overflow vulnerability affecting EFS Software Easy Chat Server versions 2.0 through 3.1. An unauthenticated attacker can exploit this by sending an excessively long username string during user registration, potentially leading to arbitrary code execution. With a CVSS score of 9.8 (Critical), this vulnerability has a low attack complexity and allows for complete compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog, a Metasploit module exists for this exploit, indicating readily available exploit code, though there is no evidence of active exploitation or significant community discussion.