Windows NT 4.0 before SP3 allows remote attackers to bypass firewall restrictions or cause a denial of service (crash) by sending improperly fragmented IP packets without the first fragment, which the TCP/IP stack incorrectly reassembles into a valid session.

The Webgais program allows a remote user to execute arbitrary commands.

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

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.

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.

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

A password for accessing a WWW URL is guessable.

A DNS server allows inverse queries.

A DNS server allows zone transfers.

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

Denial of service in Qmail through long SMTP commands.

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 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.

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

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

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

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

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

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

RIP v1 is susceptible to spoofing.

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

Listening TCP ports are sequentially allocated, allowing spoofing attacks.

ping in Solaris 2.3 through 2.6 allows local users to cause a denial of service (crash) via a ping request to a multicast address through the loopback interface, e.g. via ping -i.

Buffer overflow in eeprom in Solaris 2.5.1 and earlier allows local users to gain root privileges via a long command line argument.

Buffer overflow in zgv in svgalib 1.2.10 and earlier allows local users to execute arbitrary code via a long HOME environment variable.