An issue was discovered in GFI Kerio Connect 9.4.1 patch 1 (fixed in 10.0.0). There is a stack-based Buffer Overflow in the webmail component's 2FASetup function via an authenticated request with a long primaryEMailAddress field to the webmail/api/jsonrpc URI.

Kerio Connect 8.0.0 through 9.2.2, and Kerio Connect Client desktop application for Windows and Mac 9.2.0 through 9.2.2, when e-mail preview is enabled, allows remote attackers to conduct clickjacking attacks via a crafted e-mail message.

The STARTTLS implementation in Kerio Connect 7.1.4 build 2985 and MailServer 6.x does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411. NOTE: some of these details are obtained from third party information.