CVE-1999-1087 json
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…
published 1999-12-31 26 y ago modified 2026-06-16 4 mo ago also EUVD-1999-1068
- cvss
- 7.5
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.4%
- EPSS 6.4% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
6.40% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
References
-
support.microsoft.com
/support/kb/articles/q168/6/17.asp
vendor-advisory, patch
-
docs.microsoft.com
/en-us/security-updates/securitybulletins/1998/ms98-016
vendor-advisory
- microsoft.com /Windows/Ie/security/dotless.asp
-
osvdb.org
/7828
vdb-entry
-
exchange.xforce.ibmcloud.com
/vulnerabilities/2209
vdb-entry
Sources
- CVE List CVE-1999-1087
- NVD CVE-1999-1087
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