Security readout for executives and security teams
Plain-English summary
This CVE describes NEC voicemail systems that may allow unlimited telephone login attempts. That can make voicemail PINs vulnerable to guessing, especially where the telephone user interface is reachable. The sources do not provide a CVSS score, confirmed exploitation, or a vendor patch.
Executive priority
Treat this as an exposure discovery and legacy-system risk item. Escalate if these voicemail systems remain externally reachable or protect sensitive executive, legal, customer, or operational messaging.
Technical view
NEC UM8000, UM4730, and prior non-InMail voicemail systems are reported to lack an effective login-attempt limit in the telephone user interface. The issue enables brute-force attempts against TUI authentication. The public bundle does not include CWE mapping, affected CPEs, fixed versions, or exploit evidence.
Likely exposure
Exposure is most likely in organizations still operating NEC UM8000, UM4730, or earlier non-InMail voicemail platforms with phone-accessible TUI login. The source data does not provide precise affected version ranges beyond “all known software versions.”
Exploitation context
CISA KEV status is false in the bundle, and no cited source confirms active exploitation. The plausible abuse case is repeated voicemail login guessing through the TUI, but the bundle does not document public exploit tooling or observed campaigns.
Researcher notes
The record is sparse: no CVSS, CWE, CPE, fixed release, or vendor advisory is included. Analysis should stay tied to the described TUI brute-force condition and avoid assuming broader NEC product impact.
Mitigation direction
- Check NEC or maintainer guidance for supported fixes or configuration advice.
- Inventory NEC voicemail systems and identify TUI exposure paths.
- Review voicemail PIN policy and lockout capabilities with the vendor.
- Prioritize retirement or support review for unsupported legacy voicemail platforms.
Validation and detection
- Confirm whether NEC UM8000, UM4730, or prior non-InMail systems are deployed.
- Verify current software version and vendor support status.
- Determine whether TUI login enforces attempt limits or lockout.
- Review logs or call records for abnormal repeated login failures.
Public sources used
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-20031 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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
- https://shadytel.su/files/nec_cve.txtCVE reference · x_refsource_MISC
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.