CVE-1999-1087: n/a vulnerability

CVE-1999-1087: Internet Explorer 4 treats a 32-bit number ("dotless IP address") in the a URL as the hostname instead of a...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 1, 2024, 17:02 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-1999-1087 is a legacy Internet Explorer 4 URL parsing flaw. A remote site could use a dotless 32-bit numeric address so IE treated the page under Local Intranet Zone trust, allowing unauthorized browser actions beyond normal Internet Zone restrictions. Exposure is mainly limited to systems still using Internet Explorer 4 or preserving comparable legacy IE behavior. Normal modern browser environments are unlikely to be exposed, but legacy kiosks, lab systems, or isolated business applications should be checked. Low for most organizations, because the affected technology is obsolete. Prioritize only if the business still runs IE4-era systems or legacy browser workflows that can reach untrusted web content. Mitigation focus: Identify any remaining Internet Explorer 4 or legacy IE-dependent systems.; Check Microsoft MS98-016 and related vendor guidance for the official fix or workaround.; Retire or isolate systems that require unsupported legacy browsers..

Prepared: Jul 11, 2026, 13:00 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-1999-1087 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Mar 9, 2002, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
MS98-016CVE reference · vendor-advisory, x_refsource_MS
ie-dotless(2209)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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