Microsoft Windows TAR File Parsing NTLM Relay Vulnerability (CVE-2025-59284)

This vulnerability allows remote attackers to relay NTLM credentials on affected installations of Microsoft Windows.

User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of TAR files. A crafted hard link in a TAR file can trigger an outgoing SMB request.

An attacker can leverage this vulnerability to relay NTLM credentials in the context of the current user.

Microsoft has issued an update to correct this vulnerability.

I am one of the editors here at www.systemtek.co.uk I am a UK based technology professional, with an interest in computer security and telecoms.