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    CVE-1999-1591

    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.

    Published:Dec 31, 1999
    Last Modified:Apr 16, 2026
    EPS:Jul 5, 2007
    EPSS Score:0.12549
    CVSS Score:7.5

    Affected Products

    Vendor
    Microsoft
    Product
    Internet Information Server
    Vendor
    Microsoft
    Product
    Visual Interdev

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High