Multiple buffer overflows in Thomas Hauck Jana Server 2.x through 2.2.1, and 1.4.6 and earlier, allow remote attackers to cause a denial of service and possibly execute arbitrary code via (1) an HTTP GET request with a long major version number, (2) an HTTP GET request to the HTTP proxy on port 3128 with a long major version number, (3) a long OK reply from a POP3 server, and (4) a long SMTP server response.

Thomas Hauck Jana Server 2.x through 2.2.1, and 1.4.6 and earlier, generates different responses for valid and invalid usernames, which allows remote attackers to identify valid users on the server.

Thomas Hauck Jana Server 2.x through 2.2.1, and 1.4.6 and earlier, allows remote attackers to cause a denial of service (resource exhaustion) via a large number of FTP PASV requests, which consumes all available FTP ports.

Thomas Hauck Jana Server 2.x through 2.2.1, and 1.4.6 and earlier, does not restrict the number of unsuccessful login attempts, which makes it easier for remote attackers to gain privileges via brute force username and password guessing.

Signedness error in Thomas Hauck Jana Server 2.x through 2.2.1, and 1.4.6 and earlier, allows remote attackers to execute arbitrary code via long (1) Username, (2) Password, or (3) Hostname entries.

Thomas Hauck Jana Server 1.4.6 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a large message index value in a (1) RETR or (2) DELE command to the POP3 server, which exceeds the array limits and allows a buffer overflow attack.