CVE-2024-57725Public exploit

Internet service disruption via unauthenticated GPON rewrite

Published Feb 14, 2025 · Updated Feb 18, 2025

Missing authentication in Arcadyan Livebox Fibra PRV3399B_B_LT allows remote attackers to interrupt Internet service from an adjacent network. The firstconnection.cgi backend accepts a sessionless POST containing a Base64-encoded hexadecimal pwd value and overwrites the ONT credential. Reachability normally requires LAN or Wi-Fi access; Internet exploitation requires remote-management exposure, and an invalid value leaves the router offline until manual reconfiguration.

CVSS severity6.5
Medium
EPSS probability6.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Arcadyan Livebox Fibra PRV3399B_B_LT allows remote attackers to interrupt Internet service from an adjacent network. The firstconnection.cgi backend accepts a sessionless POST containing a Base64-encoded hexadecimal pwd value and overwrites the ONT credential. Reachability normally requires LAN or Wi-Fi access; Internet exploitation requires remote-management exposure, and an invalid value leaves the router offline until manual reconfiguration.

The record

CVE
CVE-2024-57725
Published
Feb 14, 2025
Updated
Feb 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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