Melange Chat Server (aka M-Chat), when accessed via a web browser, automatically sends cookies and other sensitive information for a server to any port specified in the associated link, which allows local users on that server to read the cookies from HTTP headers and possibly gain sensitive information, such as credentials, by setting up a listening port and reading the credentials when the victim clicks on the link.

Buffer overflow in Melange Chat System 1.10 allows remote attackers to cause a denial of service (chat server crash) and possibly execute arbitrary code via the msgText buffer in the chat_InterpretData function, as demonstrated via a long Nick (nickname) request.

Multiple buffer overflows in Melange Chat server 2.02 allow remote or local attackers to cause a denial of service (crash) and possibly execute arbitrary code via (1) a long argument in the /yell command, (2) long lines in the /etc/melange.conf configuration file, (3) long file names, or possibly other attacks.