Security readout for executives and security teams
Plain-English summary
CVE-2019-20025 describes a hardcoded credential issue in certain NEC SV9100 PBX software builds. A remote unauthenticated attacker could log in with manufacturer-level access on affected devices. This is business-relevant because PBX compromise can affect voice services, call routing, configuration integrity, and potentially sensitive communications metadata.
Executive priority
Treat this as a high-priority telephony infrastructure exposure if SV9100 systems are present. The impact is privileged remote access, but the exact affected build list and fix status are incomplete in the provided sources, so prioritize inventory, exposure reduction, and vendor confirmation.
Technical view
The CVE reports an undocumented account with manufacturer privilege level in certain NEC SV9100 software builds. Affected systems are SV9100 PBXes running software release 6.0 or higher; releases before 6.0 are stated as unaffected. No CVSS, CWE, patch version, or precise build list is provided in the source bundle.
Likely exposure
Exposure is limited to NEC SV9100 PBX systems on software release 6.0 or later, especially where remote login or management access is reachable from untrusted networks. The sources say “certain builds,” so exact vulnerable build confirmation requires vendor guidance or local validation.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. The vulnerability is remotely reachable in principle because the described attack path is remote login using a static credential, but no exploit campaign or weaponized exploit status is cited.
Researcher notes
The CVE description is specific about SV9100 release 6.0 or higher and manufacturer-level access, but the bundle lacks CVSS, CWE, vendor patch data, and exact affected builds. Do not assume all 6.0+ deployments are vulnerable without confirming “certain builds” through NEC or authorized support information.
Mitigation direction
- Check NEC or support-channel guidance for affected builds and fixed releases.
- Restrict PBX management access to trusted administrative networks only.
- Remove internet exposure for SV9100 login and management services.
- Place PBX administration behind VPN, firewall ACLs, or equivalent controls.
- Review accounts and configuration for unauthorized manufacturer-level changes.
- Increase monitoring for unusual PBX login and administration activity.
Validation and detection
- Inventory all NEC SV9100 PBX systems and software release versions.
- Flag SV9100 systems running release 6.0 or higher for vendor confirmation.
- Confirm whether remote login interfaces are reachable from untrusted networks.
- Review PBX logs for unexpected privileged or manufacturer-level access.
- Verify firewall rules restrict PBX management to approved administrators.
- Document vendor patch or mitigation status for each affected PBX.
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.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-20025 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
- 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.