CVE-2024-57725
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 · uneditedAn issue in the Arcadyan Livebox Fibra PRV3399B_B_LT allows a remote or local attacker to modify the GPON link value without authentication, causing an internet service disruption via the /firstconnection.cgi endpoint.
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 Arcadyan Livebox Fibra PRV3399B_B_LT router has an authentication bypass vulnerability in the /firstconnection.cgi endpoint. An unauthenticated remote or local attacker can modify GPON link configuration values, causing internet service disruption.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Confirm device modelAccess the router's web interface or check the device label to verify the model number is Arcadyan Livebox Fibra PRV3399B_B_LTAffected if The device model matches PRV3399B_B_LT and the firmware has not been patched
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Check firmware versionLog into the router admin panel and navigate to the status or system information page to view the installed firmware versionAffected if The firmware version is older than the vendor patch (if known) or remains at the original vulnerable version
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Verify endpoint accessibilityAttempt to access http://<router-ip>/firstconnection.cgi from an unauthenticated browser sessionAffected if The endpoint loads or responds without requiring login credentials, indicating the authentication bypass is present
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Check GPON configuration integrityLog into the router admin panel and navigate to the GPON or WAN settings to review the current link configuration values (OLT ID, ONU ID, optical power settings)Affected if GPON parameters have been altered unexpectedly or differ from your known-good baseline configuration
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Audit access logs for endpoint hitsReview router logs or firewall logs for any requests to /firstconnection.cgi from unauthorized IP addressesAffected if Logs show unauthenticated access to the firstconnection.cgi endpoint from unexpected sources
If the device is an Arcadyan Livebox Fibra PRV3399B_B_LT with unpatched firmware and the /firstconnection.cgi endpoint is accessible without authentication, the device is affected by this vulnerability.
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 dataApply vendor firmware update when available. Until then, restrict network access to management interfaces via firewall rules or network segmentation, and monitor for unauthorized configuration changes.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-57725 — 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-2024-57725 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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