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Vulnerability record · CVE-1999-1591 · published 31 December 1999

CVE-1999-1591: Microsoft internet information server vulnerability

Microsoft · Internet Information Server

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.

7.5 CVSS 2.0 High EPSS 11% · top 4.2%
7.5CVSS 2.0 base score
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2008-0075Microsoft IIS ASP code injection allows remote code executionCVE-2008-0075 is an unspecified code injection flaw in Microsoft Internet Information Services (IIS) 5.1 through 6.0 that is triggered by crafted inp…EPSS 57%analysed10.0CVE-2001-0500Microsoft IIS Index Server ISAPI idq.dll buffer overflowA buffer overflow in the ISAPI extension idq.dll, used by Index Server 2.0 and Indexing Service 2000 in IIS 6.0 beta and earlier, is triggered by a l…EPSS 97%analysed10.0CVE-1999-1011Microsoft MDAC RDS DataFactory unsafe methods allow remote command executionThe Remote Data Service (RDS) DataFactory component of Microsoft Data Access Components (MDAC), as shipped with IIS 3.x and 4.x, exposes unsafe metho…EPSS 77%analysed10.0CVE-1999-0874IIS 4.0 buffer overflow via malformed .HTR, .IDC, .STM requestsIIS 4.0 contains a memory buffer overflow reachable through malformed requests for files with .HTR, .IDC, or .STM extensions. The record describes th…EPSS 75%analysed10.0CVE-1999-0407Microsoft internet information server vulnerabilityBy default, IIS 4.0 has a virtual directory /IISADMPWD which contains files that can be used as proxies for brute force password attacks, or to ident…EPSS 5.1%10.0CVE-1999-1376Microsoft internet information server vulnerabilityBuffer overflow in fpcount.exe in IIS 4.0 with FrontPage Server Extensions allows remote attackers to execute arbitrary commands.EPSS 24%9.3CVE-2008-1709Microsoft visual interdev memory buffer overflow vulnerabilityBuffer overflow in Microsoft Visual InterDev 6.0 (SP6) allows user-assisted attackers to execute arbitrary code via a Studio Solution (.SLN) file wit…EPSS 13%9.3CVE-2008-0250Microsoft visual interdev memory buffer overflow vulnerabilityBuffer overflow in Microsoft Visual InterDev 6.0 (SP6) allows user-assisted attackers to execute arbitrary code via a Studio Solution (.SLN) file wit…EPSS 17%

Source: NIST National Vulnerability Database (record CVE-1999-1591), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.