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Vulnerability record · CVE-1999-1087 · published 31 December 1999

CVE-1999-1087: Microsoft internet explorer vulnerability

Microsoft · Internet Explorer

Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname instead of an IP address, which causes IE to apply Local Intranet Zone settings to the resulting web page, allowing remote malicious web servers to conduct unauthorized activities by using URLs that contain the dotless IP address for their server.

7.5 CVSS 2.0 High EPSS 6.4% · top 6.6%
7.5CVSS 2.0 base score
6.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname instead of an IP address, which causes IE to apply Local Intranet Zone settings to the resulting web page, allowing remote malicious web servers to conduct unauthorized activities by using URLs that contain the dotless IP address for their server.

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

Affected products

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

References

LinkTags
http://support.microsoft.com/support/kb/articles/q168/6/17.asp PatchVendor Advisory
http://www.microsoft.com/Windows/Ie/security/dotless.asp
http://www.osvdb.org/7828
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-016
https://exchange.xforce.ibmcloud.com/vulnerabilities/2209
http://support.microsoft.com/support/kb/articles/q168/6/17.asp PatchVendor Advisory
http://www.microsoft.com/Windows/Ie/security/dotless.asp
http://www.osvdb.org/7828
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-016
https://exchange.xforce.ibmcloud.com/vulnerabilities/2209

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-1999-1087), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.