Kerio Personal Firewall (KPF) 2.1.5 allows local users to execute arbitrary code with SYSTEM privileges via the Load button in the Firewall Configuration Files option, which does not drop privileges before opening the file loading dialog box.

Kerio WinRoute Firewall before 6.0.9 uses information from PTR queries in response to A queries, which allows remote attackers to poison the DNS cache or cause a denial of service (connection loss).

Unspecified vulnerability in Kerio MailServer before 6.0.3 has unknown impact and unknown remote attack vectors, related to a "potential security issue."

Kerio Personal Firewall 4.0 (KPF4) allows local users with administrative privileges to bypass the Application Security feature and execute arbitrary processes by directly writing to \device\physicalmemory to restore the running kernel's SDT ServiceTable.

Kerio Personal Firewall (KPF) 2.1.4 has a default rule to accept incoming packets from DNS (UDP port 53), which allows remote attackers to bypass the firewall filters via packets with a source port of 53.

Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer 5.6.3 allow remote attackers to insert arbitrary web script via (1) the add_name parameter in the add_acl module, or (2) the alias parameter in the do_map module.

Multiple buffer overflows in Kerio MailServer 5.6.3 allow remote authenticated users to cause a denial of service and possibly execute arbitrary code via (1) a long showuser parameter in the do_subscribe module, (2) a long folder parameter in the add_acl module, (3) a long folder parameter in the list module, and (4) a long user parameter in the do_map module.

Kerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to execute administrator commands by sniffing packets from a valid session and replaying them against the remote administration server.

Buffer overflow in the administrator authentication process for Kerio Personal Firewall (KPF) 2.1.4 and earlier allows remote attackers to execute arbitrary code via a handshake packet.

Kerio MailServer 5.0 allows remote attackers to cause a denial of service (hang) via SYN packets to the supported network services.