CVE-2025-7635: Calix GigaCenter ONT - Unauthenticated Telnet
Published Sep 9, 2025
·Updated
Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.
Affected Software
6 affected components
Calix GigaCenter ONT>=844E<=854GE
Calix Calix GigaCenter ONT
Calix Calix GigaCenter ONT=844e
Calix Calix GigaCenter ONT=844g
Calix Calix GigaCenter ONT=844ge
Calix Calix GigaCenter ONT=854ge
Event History
Sep 9, 2025
CVE Published
via MITRE·08:08 PM
Data Sourced
via MITRE·08:08 PM
DescriptionWeakness
Data Sourced
via NVD·08:15 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-7635?
CVE-2025-7635 is considered critical due to the potential for unauthenticated root access via Telnet on vulnerable devices.
2
How do I fix CVE-2025-7635?
To mitigate CVE-2025-7635, it is recommended to disable Telnet access and update to the latest firmware provided by Calix.
3
Which devices are affected by CVE-2025-7635?
CVE-2025-7635 affects Calix GigaCenter ONT models 844E, 844G, 844GE, and 854GE.
4
Is there a workaround for CVE-2025-7635?
As a workaround for CVE-2025-7635, users should restrict network access to the affected devices and monitor for unauthorized access.
5
What type of access does CVE-2025-7635 allow?
CVE-2025-7635 allows unauthenticated Telnet access that can lead to full root access on the affected GigaCenter ONT devices.