This update eliminates two security vulnerabilities:
The "Spoofed Route Pointer" vulnerability. This vulnerability could allow a malicious user to obtain network or other information by performing source routing via your Windows 95 computer, even if source routing has been disabled. Installing this update will eliminate this vulnerability and provide additional control over source routing. For more information, please visit Microsoft Security Bulletin MS99-038.
The "Fragmented IGMP Packet" vulnerability. This vulnerability exists in TCP/IP stack implementations of Microsoft Windows 95. If fragmented or malformed, Internet Group Management Protocol (IGMP) data packets can cause a variety of problems in Windows 95, ranging from slowing system performance to system failure. For more information, please visit Microsoft Security Bulletin MS99-034.