CVE-2017-13871

CVE-2017-13871 describes a vulnerability in the Mail component of macOS versions prior to 10.13.2. This flaw allows remote attackers to read the cleartext content of S/MIME encrypted emails if the recipient has not installed the corresponding S/MIME certificate. With a CVSS score of 7.5 (HIGH), this vulnerability has a network attack vector and low attack complexity, potentially leading to a high impact on confidentiality. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.