Security readout for executives and security teams
This is a legacy Microsoft IIS upgrade issue. When IIS 2 or 3 was upgraded to IIS 4, ism.dll could be left under /scripts/iisadmin without local-only access controls. A remote unauthorized user could view sensitive server information, reportedly including the Administrator password. Exposure is most plausible on obsolete Microsoft IIS 4 installations that were upgraded from IIS 2 or IIS 3 and retained /scripts/iisadmin/ism.dll. Modern environments are unlikely to be affected unless legacy servers remain reachable. Treat as high priority only if legacy IIS 4 exists. The business risk is credential and server information exposure, but the vulnerability is very old and likely irrelevant to fully modernized environments. Mitigation focus: Identify and retire any remaining IIS 4 systems, especially upgraded IIS 2 or IIS 3 servers.; Check Microsoft’s historical advisory before changing legacy production systems.; Remove or restrict the leftover ism.dll only after confirming vendor guidance and application dependencies..
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
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ATT&CK lookup starting points
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Credential and access behavior lookup
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Open ATT&CK lookupCVE-1999-1538 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
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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
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.