What’s Vulnerable › Vulnerabilities

CVE-1999-1591

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2007-07-05 · updated 2026-06-16

Description

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.

Affected products

• Microsoft Internet Information Server: 4.0-sp4
• Microsoft Visual Interdev: 6.0

References

• http://archives.neohapsis.com/archives/ntbugtraq/1998-1999/msg00276.html
• http://archives.neohapsis.com/archives/ntbugtraq/1998-1999/msg00277.html
• http://www.securityfocus.com/bid/190
• http://archives.neohapsis.com/archives/ntbugtraq/1998-1999/msg00276.html
• http://archives.neohapsis.com/archives/ntbugtraq/1998-1999/msg00277.html
• http://www.securityfocus.com/bid/190

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