JavaScript in Internet Explorer 3.x and 4.x, and Netscape 2.x, 3.x and 4.x, allows remote attackers to monitor a user's web activities, aka the Bell Labs vulnerability.

websendmail in Webgais 1.0 allows a remote user to access arbitrary files and execute arbitrary code via the receiver parameter ($VAR_receiver variable).

wu-ftpd 2.4 FTP server does not properly drop privileges when an ABOR (abort file transfer) command is executed during a file transfer, which causes a signal to be handled incorrectly and allows local and possibly remote attackers to read arbitrary files.

Listening TCP ports are sequentially allocated, allowing spoofing attacks.

Buffer overflow in wu-ftp from PASV command causes a core dump.

RIP v1 is susceptible to spoofing.

The aglimpse CGI program of the Glimpse package allows remote execution of arbitrary commands.

The Perl fingerd program allows arbitrary command execution from remote users.

Windows 95/NT out of band (OOB) data denial of service through NETBIOS port, aka WinNuke.

wu-ftpd FTP daemon allows any user and password combination.

NFS allows attackers to read and write any file on the system by specifying a false UID.

When compiled with the -DALLOW_UPDATES option, bind allows dynamic updates to the DNS server, allowing for malicious modification of DNS records.

Denial of service in RPC portmapper allows attackers to register or unregister RPC services or spoof RPC services using a spoofed source IP address such as 127.0.0.1.

Buffer overflow in FTP Serv-U 2.5 allows remote authenticated users to cause a denial of service (crash) via a long (1) CWD or (2) LS (list) command.

Denial of service in Qmail through long SMTP commands.

An X server's access control is disabled (e.g. through an "xhost +" command) and allows anyone to connect to the server.

A DNS server allows zone transfers.

A DNS server allows inverse queries.

A password for accessing a WWW URL is guessable.

The rwho/rwhod service is running, which exposes machine status and user information.