Windows NT 4.0 allows remote attackers to cause a denial of service via a malformed SMB logon request in which the actual data size does not match the specified size.

Windows NT TCP/IP processes fragmented IP packets improperly, causing a denial of service.

Access violation in LSASS.EXE (LSA/LSARPC) program in Windows NT allows a denial of service.

Windows NT RSHSVC program allows remote users to execute arbitrary commands.

Buffer overflow in War FTP allows remote execution of commands.

Bonk variation of teardrop IP fragmentation denial of service.

Denial of service in Windows NT DNS servers through malicious packet which contains a response to a query that wasn't made.

Denial of service in Windows NT DNS servers by flooding port 53 with too many characters.

In IIS, remote attackers can obtain source code for ASP files by appending "::$DATA" to the URL.

Denial of service in telnet from the Windows NT Resource Kit, by opening then immediately closing a connection.

The WINS server in Microsoft Windows NT 4.0 before SP4 allows remote attackers to cause a denial of service (process termination) via invalid UDP frames to port 137 (NETBIOS Name Service), as demonstrated via a flood of random packets.

Denial of service through Winpopup using large user names.

NT users can gain debug-level access on a system process using the Sechole exploit.

In some cases, Service Pack 4 for Windows NT 4.0 can allow access to network shares using a blank password, through a problem with a null NT hash value.

The installer for BackOffice Server includes account names and passwords in a setup file (reboot.ini) which is not deleted.

Local users in Windows NT can obtain administrator privileges by changing the KnownDLLs list to reference malicious programs.

The screen saver in Windows NT does not verify that its security context has been changed properly, allowing attackers to run programs with elevated privileges.

The Forms 2.0 ActiveX control (included with Visual Basic for Applications 5.0) can be used to read text from a user's clipboard when the user accesses documents with ActiveX content.

The cryptographic challenge of SMB authentication in Windows 95 and Windows 98 can be reused, allowing an attacker to replay the response and impersonate a user.

Remote attackers can perform a denial of service in Windows machines using malicious ARP packets, forcing a message box display for each packet or filling up log files.