CVE-2017-7229

CVE-2017-7229 describes a critical vulnerability in Vaultive O365 (versions prior to 4.5.21) where PGP/MIME encrypted messages have their Content-Type header altered, rendering them undecryptable by most mail user agents. This leads to a denial of service for encrypted communications and can result in sensitive information being resent in plaintext, causing information disclosure. With a CVSS score of 9.1 (CRITICAL), the vulnerability is easily exploitable over the network with low attack complexity and no user interaction, potentially leading to high confidentiality and availability impacts. While there is no evidence of active exploitation or publicly available exploit code, the vulnerability has garnered significant community discussion, indicating awareness among security professionals.