CVE-2019-20027
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAspire-derived NEC PBXes, including the SV8100, SV9100, SL1100 and SL2100 with software releases 7.0 or higher contain the possibility if incorrectly configured to allow a blank username and password combination to be entered as a valid, successfully authenticating account.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceNEC Aspire-derived PBX systems (SV8100, SV9100, SL1100, SL2100) running software 7.0+ have a critical authentication bypass vulnerability where incorrect configuration allows a blank username and password to be accepted as valid credentials, enabling unauthenticated attackers to gain administrative access to the telecommunications system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 7.0>= 7.0>= 7.0>= 7.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify PBX model and firmware versionAccess the system administration interface or use the vendor-provided management tool to retrieve the device model and current firmware version. Common access points include the web-based management console or the system programming mode.Affected if The device model is SV8100, SV9100, SL1100, and SL2100 AND the firmware version is 7.0 or higher
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Locate authentication configuration settingsNavigate to the system security or user management section within the PBX administration interface. Look for settings related to login authentication, password policy, or user account configuration.Affected if Authentication settings allow empty (blank) username or password fields, or a default/admin account is configured with no password
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Review configured user accountsExamine the list of all user accounts configured on the PBX system, particularly administrative accounts. Check each account for blank username or blank password fields.Affected if Any account exists with a blank username, blank password, or both
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Test credential acceptance with blank fieldsAttempt to authenticate to the PBX management interface using an empty username field and empty password field. Observe whether the system accepts these blank credentials as valid.Affected if The system grants access or accepts the login attempt when both username and password fields are left empty
A user is affected if their NEC PBX model is an SV8100, SV9100, SL1100, or SL2100 running firmware version 7.0 or higher AND the authentication configuration permits blank username or password credentials.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataReview and reconfigure the PBX authentication settings to explicitly require non-empty username and password credentials; disable any configuration allowing blank or default credentials; verify no unauthorized accounts exist with blank credentials.
- Consultation4.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-20027 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-20027 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data