LiveActive security incident?Get immediate response
CVE Record

CVE-1999-0420: umapfs allows local users to gain root privileges by changing their uid through a malicious mount_umap prog...

umapfs allows local users to gain root privileges by changing their uid through a malicious mount_umap program.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-1999-0420 describes a local privilege escalation involving umapfs and mount_umap. A user who already has local access may be able to become root. The public record does not name affected operating systems, versions, patches, or current exploitation.

Executive priority

Treat as a targeted legacy-system risk. Urgency depends on whether any managed systems still expose umapfs or mount_umap with local user access.

Technical view

The CVE description says umapfs permits local users to gain root privileges by changing their uid through a malicious mount_umap program. No CVSS score, CWE, concrete CPE, or vendor/product/version data is provided in the supplied sources.

Likely exposure

Exposure is only plausible on legacy systems that include or enable umapfs and mount_umap. The supplied data lists affected products as n/a, so environment-specific validation is required.

Exploitation context

The bundle marks KEV as false. The provided sources do not state active exploitation, public exploit availability, affected versions, or patch status.

Researcher notes

The record is sparse and old. Do not generalize beyond local privilege escalation via umapfs and mount_umap unless vendor-specific evidence identifies affected platforms and remediation.

Mitigation direction

  • Check operating-system vendor guidance for umapfs or mount_umap advisories.
  • Prioritize vendor-supported updates or retirement where umapfs is present.
  • Limit local shell access on any system requiring legacy umapfs functionality.
  • Document compensating controls if vendor fixes are unavailable.

Validation and detection

  • Inventory systems for umapfs and mount_umap presence.
  • Confirm whether any local users can access affected legacy hosts.
  • Review vendor advisories for exact affected platforms and fixes.
  • Check configuration management for umapfs enablement or mount permissions.
Prepared
Confidence
medium
Sources
3

Public sources used

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

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-1999-0420 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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
2Source links

CVSS and timeline data

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.