CVE-1999-0506

Windows NT and Windows 2000 - Unauthenticated Remote Access via Null Password

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-1999-0506. Includes Metasploit module auxiliary/scanner/vnc/vnc_login.

AI-analyzed exploit summary This Metasploit module scans VNC servers for weak or blank passwords by attempting authentication using the RFB protocol. It supports brute-forcing credentials and reports successful logins.

Description

A Windows NT domain user or administrator account has a default, null, blank, or missing password.

Exploits (3)

metasploit SCANNER
rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/vnc/vnc_login.rb

This Metasploit module scans VNC servers for weak or blank passwords by attempting authentication using the RFB protocol. It supports brute-forcing credentials and reports successful logins.

Classification
Scanner 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: VNC servers (RFB protocol versions 3.3, 3.7, 3.8, 4.001)
No auth needed
Prerequisites: Network access to VNC server (default port 5900)
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit SCANNER
rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/mssql/mssql_login.rb

This Metasploit module is a credential brute-forcing utility for MSSQL, designed to test authentication against a target MSSQL instance. It supports session creation upon successful login and includes options for encryption and proxy usage.

Classification
Scanner 100%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Microsoft SQL Server (MSSQL)
No auth needed
Prerequisites: Network access to the MSSQL instance · Valid or potential credentials to test
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit SCANNER
rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/smb/smb_login.rb

This is a Metasploit auxiliary module for brute-forcing SMB login credentials. It supports various authentication methods including Kerberos and reports successful logins.

Classification
Scanner 100%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: SMB (Server Message Block) protocol
No auth needed
Prerequisites: Network access to SMB service · Valid or guessable credentials
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References
Various Sources x_refsource_misc
https://www.cve.org/CVERecord?id=CVE-1999-0506

Scores

EPSS 0.1730
EPSS Percentile 96.7%

Details

Status published
Products (2)
microsoft/windows_2000
microsoft/windows_nt
Published Oct 01, 1998
Tracked Since Feb 18, 2026