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Vulnerability record · CVE-1999-1538 · published 14 January 1999

CVE-1999-1538: Microsoft internet information server vulnerability

Microsoft · Internet Information Server

When IIS 2 or 3 is upgraded to IIS 4, ism.dll is inadvertently left in /scripts/iisadmin, which does not restrict access to the local machine and allows an unauthorized user to gain access to sensitive server information, including the Administrator's password.

2.1 CVSS 2.0 Low EPSS 25% · top 2.1%
2.1CVSS 2.0 base score
25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

When IIS 2 or 3 is upgraded to IIS 4, ism.dll is inadvertently left in /scripts/iisadmin, which does not restrict access to the local machine and allows an unauthorized user to gain access to sensitive server information, including the Administrator's password.

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

Affected products

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

References

LinkTags
http://marc.info/?l=bugtraq&m=91638375309890&w=2
http://marc.info/?l=ntbugtraq&m=91632724913080&w=2
http://www.securityfocus.com/bid/189 Exploit
http://marc.info/?l=bugtraq&m=91638375309890&w=2
http://marc.info/?l=ntbugtraq&m=91632724913080&w=2
http://www.securityfocus.com/bid/189 Exploit

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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%9.0CVE-2009-3023Microsoft IIS FTP Service buffer overflow via crafted NLST commandThe FTP Service in Microsoft IIS 5.0 through 6.0 contains a classic buffer overflow (CWE-120) triggered by a crafted NLST command using wildcards, ca…EPSS 91%analysed8.5CVE-2010-1256Microsoft internet information server code injection vulnerabilityUnspecified vulnerability in Microsoft IIS 6.0, 7.0, and 7.5, when Extended Protection for Authentication is enabled, allows remote authenticated use…EPSS 28%

Source: NIST National Vulnerability Database (record CVE-1999-1538), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.