CVE-1999-1087
Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-1999-1087- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-1999-1087- Updated
- 2026-11-02
EUVDEUVD-1999-1068 No score
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.
- Record
EUVD-1999-1068- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9rv3-rxw8-xr7c No score
Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname...
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.
- Record
GHSA-9rv3-rxw8-xr7c- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-1999-1087 is a high vulnerability (CVSS 7.5) in Microsoft Internet Explorer, published December 31, 1999. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.40%, the 93rd percentile. No source names a fixed version.
References
microsoft.com/Windows/Ie/security/dotless.asp
osvdb.org/7828
docs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-016
support.microsoft.com/support/kb/articles/q168/6/17.asp
exchange.xforce.ibmcloud.com/vulnerabilities/2209
nvd.nist.gov/vuln/detail/CVE-1999-1087
github.com/advisories/GHSA-9rv3-rxw8-xr7c