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Vulnerability record · CVE-1999-0867 · published 11 August 1999

CVE-1999-0867: Microsoft commercial internet system improper input validation vulnerability

Microsoft · Commercial Internet System

Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

5.0 CVSS 2.0 Medium EPSS 22% · top 2.5% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

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

Affected products

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

References

LinkTags
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ238349
http://www.ciac.org/ciac/bulletins/j-058.shtml
http://www.securityfocus.com/bid/579
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-029
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ238349
http://www.ciac.org/ciac/bulletins/j-058.shtml
http://www.securityfocus.com/bid/579
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-029

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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-1999-0867), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.