CVE intelligence and bounded remediation

CVE-2019-20025 — Nec Sv9100 Firmware security vulnerability

Critical CVSS 9.8

Certain builds of NEC SV9100 software could allow an unauthenticated, remote attacker to log into a device running an affected release with a hardcoded username and password, aka a Static Credential Vulnerability. The vulnerability is due to an undocumented user account with manufacturer privilege level. An attacker could exploit this vulnerability by using this account to remotely log into an affected device. A successful exploit could allow the attacker to log into the device with manufacturer level access. This vulnerability affects SV9100 PBXes that are running software release 6.0 or higher. This vulnerability does not affect SV9100 software releases prior to 6.0.

Severity
Critical
CVSS
9.8 (3.1)
Published
2020-07-29
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-798

Affected products

  • nec / sv9100_firmware

Matched remediation archetype

Authentication bypass and missing authentication

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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