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.

Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer before 6.6.2 allow remote attackers to inject arbitrary web script or HTML via the (1) folder parameter to mailCompose.php or the (2) daytime parameter to calendarEdit.php. NOTE: some of these details are obtained from third party information.

Cross-site scripting (XSS) vulnerability in error413.php in Kerio MailServer before 6.6.2 allows remote attackers to inject arbitrary web script or HTML via the sent parameter. NOTE: some of these details are obtained from third party information.

Unspecified vulnerability in Kerio MailServer before 6.5.0 allows remote attackers to cause a denial of service (crash) via unspecified vectors related to decoding of uuencoded input, which triggers memory corruption.

Unspecified vulnerability in Kerio MailServer before 6.3.1 allows remote attackers to cause a denial of service (segmentation fault and service stop) via certain long LDAP queries, as demonstrated by vd_kms6.pm.

Unspecified vulnerability in Kerio MailServer before 6.1.4 has unknown impact and remote attack vectors related to a "possible bypass of attachment filter."

Kerio MailServer before 6.1.3 Patch 1 allows remote attackers to cause a denial of service (application crash) via a crafted IMAP LOGIN command.

The administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote attackers to quickly obtain passwords that are 5 characters or less via brute force methods.

The administration protocol for Kerio WinRoute Firewall 6.x up to 6.0.10, Personal Firewall 4.x up to 4.1.2, and MailServer up to 6.0.8 allows remote attackers to cause a denial of service (CPU consumption) via certain attacks that force the product to "compute unexpected conditions" and "perform cryptographic operations."

Unknown vulnerability in WebMail in Kerio MailServer before 6.0.9 allows remote attackers to cause a denial of service (CPU consumption) via certain e-mail messages.