CVE-2026-31851
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 · uneditedNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout mechanisms on authentication interfaces. An attacker can perform unlimited authentication attempts against endpoints that rely on credential validation, enabling brute-force attacks to guess administrative credentials without restriction.
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 · high confidenceThe Nexxt Solutions Nebula 300+ router firmware versions up to 12.01.01.37 lacks rate limiting and account lockout mechanisms on authentication endpoints. This allows remote attackers to perform unlimited credential validation attempts against administrative login interfaces, enabling brute-force attacks to guess administrative passwords without any restriction or throttle.
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<= 12.01.01.37CVSS 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 device model and firmware versionAccess the router admin interface (typically at 192.168.0.1 or 192.168.1.1) and navigate to Status or System Settings to view the firmware version. Alternatively, check the device label or documentation.Affected if The device is a Nexxt Solutions Nebula 300+ router and the firmware version is 12.01.01.37 or lower.
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Locate the administrative login interfaceAccess the router web interface on the default IP address and locate the login page for administrator access.Affected if The router has a web-based administrative login interface accessible.
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Test for rate limiting on failed login attemptsUsing a tool or script, attempt to submit multiple failed login credentials to the authentication endpoint (typically POST to /login or similar). Monitor whether the device blocks, throttles, or delays responses after repeated failed attempts.Affected if The device allows unlimited failed login attempts without any delay, throttle, or blocking response.
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Verify account lockout mechanism does not existAttempt multiple failed login attempts with the same administrative account (or different accounts). Check if the device ever locks the account, requires captcha, or triggers any lockout notification after a threshold of failures.Affected if No account lockout, captcha, or intervention is required regardless of how many failed attempts are made.
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Check admin interface for security settingsIf accessible, navigate to the router admin panel settings (Security, Authentication, or Login settings) and look for options related to rate limiting, login attempt limits, or account lockout policies.Affected if No rate limiting or account lockout configuration options are present in the admin interface.
A user is affected if they operate a Nexxt Solutions Nebula 300+ router with firmware version 12.01.01.37 or lower, and their device permits unlimited authentication attempts without any rate limiting or account lockout protection.
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 dataImplement rate limiting on authentication endpoints with progressive delays between failed attempts, and add account lockout functionality that temporarily disables accounts or requires captcha/intervention after a threshold of failed login attempts.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-31851 — 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-2026-31851 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
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