Medium (6.5). EPSS 6.2% chance of exploitation in the next 30 days.
An 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.
Severity
CVSS 3.1
6.5 medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
6.2% chance of exploitation in the next 30 days; higher than 93% of CVEs (scores of 2026-10-31)