Buffer overflow in Microsoft Telnet client in Windows 95 and Windows 98 via a malformed Telnet argument.

Windows NT Terminal Server performs extra work when a client opens a new connection but before it is authenticated, allowing for a denial of service.

Denial of service in Windows NT messenger service through a long username.

Denial of service in Windows NT Local Security Authority (LSA) through a malformed LSA request.

A Windows NT user can disable the keyboard or mouse by directly calling the IOCTLs which control them.

Denial of service in various Windows systems via malformed, fragmented IGMP packets.

An attacker can conduct a denial of service in Windows NT by executing a program with a malformed file image header.

Windows NT searches a user's home directory (%systemroot% by default) before other directories to find critical programs such as NDDEAGNT.EXE, EXPLORER.EXE, USERINIT.EXE or TASKMGR.EXE, which could allow local users to bypass access restrictions or gain privileges by placing a Trojan horse program into the root directory, which is writable by default.

The Windows NT Client Server Runtime Subsystem (CSRSS) can be subjected to a denial of service when all worker threads are waiting for user input.

Windows NT RRAS and RAS clients cache a user's password even if the user has not selected the "Save password" option.

Buffer overflow in Windows NT 4.0 help file utility via a malformed help file.

Denial of service in Windows NT IIS server using ..\..

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.

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.

Windows 95, 98, and NT 4.0 allow remote attackers to cause a denial of service by spoofing ICMP redirect messages from a router, which causes Windows to change its routing tables.

Microsoft Personal Web Server and FrontPage Personal Web Server in some Windows systems allows a remote attacker to read files on the server by using a nonstandard URL.

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

Buffer overflow in the Mail-Max SMTP server for Windows systems allows remote command execution.

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.

Windows 95 and Windows 98 systems, when configured with multiple TCP/IP stacks bound to the same MAC address, allow remote attackers to cause a denial of service (traffic amplification) via a certain ICMP echo (ping) packet, which causes all stacks to send a ping response, aka TCP Chorusing.