Microsoft IIS 4.0 Microsoft Visual InterDev improper authentication

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability was found in Microsoft IIS 4.0 (Web Server) and classified as critical. Affected by this issue is some unknown functionality of the component Microsoft Visual InterDev Handler. The manipulation with an unknown input leads to a weak authentication vulnerability. Using CWE to declare the problem leads to CWE-287. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Microsoft Internet Information Services (IIS) server 4.0 SP4, without certain hotfixes released for SP4, does not require authentication credentials under certain conditions, which allows remote attackers to bypass authentication requirements, as demonstrated by connecting via Microsoft Visual InterDev 6.0.

The weakness was released 12/31/1999 by FIRST (Website). The advisory is available at This vulnerability is handled as CVE-1999-1591 since 07/05/2007. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 190).





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Weak authentication
CWE: CWE-287
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍


Recommended: Patch
Status: 🔍

0-Day Time: 🔍


01/18/1999 🔍
12/31/1999 +347 days 🔍
12/31/1999 +0 days 🔍
07/05/2007 +2743 days 🔍
06/23/2014 +2545 days 🔍
04/05/2019 +1747 days 🔍



Researcher: FIRST
Status: Not defined

CVE: CVE-1999-1591 (🔍)
SecurityFocus: 190 - Microsoft VisualInterDev 6.0 - IIS4- Management With No Authentication Vulnerability


Created: 06/23/2014 01:17 PM
Updated: 04/05/2019 12:28 PM
Changes: (1) advisory_person_nickname
Complete: 🔍


No comments yet. Please log in to comment.

Might our Artificial Intelligence support you?

Check our Alexa App!