Remote attackers can cause a denial of service in Sendmail 8.8.x and 8.9.2 by sending messages with a large number of headers.

DPEC Online Courseware allows an attacker to change another user's password without knowing the original password.

A race condition in the BackWeb Polite Agent Protocol allows an attacker to spoof a BackWeb server.

The demo version of the Quakenbush NT Password Appraiser sends passwords across the network in plaintext.

In some instances of SSH 1.2.27 and 2.0.11 on Linux systems, SSH will allow users with expired accounts to login.

The DCC server command in the Mirc 5.5 client doesn't filter characters from file names properly, allowing remote attackers to place a malicious file in a different location, possibly allowing the attacker to execute commands.

A race condition in Linux 2.2.1 allows local users to read arbitrary memory from /proc files.

IIS 4.0 and Apache log HTTP request methods, regardless of how long they are, allowing a remote attacker to hide the URL they really request.

A service or application has a backdoor password that was placed there by the developer.

An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).

A remote attacker can sometimes identify the operating system of a host based on how it reacts to some IP or ICMP packets, using a tool such as nmap or queso.

Remote attackers can crash Lynx and Internet Explorer using an IMG tag with a large width parameter.

A remote attacker can gain access to a file system using .. (dot dot) when accessing SMB shares.

Anonymous FTP is enabled.

A mail server is explicitly configured to allow SMTP mail relay, which allows abuse by spammers.

An unrestricted remote trust relationship for Unix systems has been set up, e.g. by using a + sign in /etc/hosts.equiv.

A system-critical NETBIOS/SMB share has inappropriate access control.

ICMP echo (ping) is allowed from arbitrary hosts.

The permissions for system-critical data in an anonymous FTP account are inappropriate. For example, the root directory is writeable by world, a real password file is obtainable, or executable commands such as "ls" can be overwritten.

A router or firewall forwards external packets that claim to come from inside the network that the router/firewall is in front of.