Security readout for executives and security teams
CVE-1999-0891 is an old Internet Explorer 5 issue where a malicious website could cause the browser to disclose local files through the download behavior and a server-side redirect. The main risk is legacy exposure: modern systems are unlikely to run IE5, but forgotten kiosks, lab machines, or legacy app environments may still matter. Exposure is likely limited to obsolete environments that still run Internet Explorer 5 or preserve IE5-era browser behavior for legacy applications. Treat this as a legacy-risk cleanup item, not a broad modern emergency. Prioritize if your organization has old Windows/browser estates, regulated data on legacy hosts, or unmanaged systems that can browse the internet. Mitigation focus: Inventory systems for Internet Explorer 5 or IE5-era browser dependencies.; Follow Microsoft MS99-040 and Q242542 guidance for remediation details.; Retire or isolate unsupported legacy browser environments..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-1999-0891 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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
- MS99-040CVE reference · vendor-advisory, x_refsource_MS
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.