CVE-2025-7635 Calix GigaCenter ONT - Unauthenticated Telnet
Unauthenticated Telnet access allows attackers to gain root privileges on Calix GigaCenter ONT devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-7635?
CVE-2025-7635 is a high-severity authentication bypass vulnerability in Calix GigaCenter ONT, published on 9 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.
Weakness: CWE-306
Which versions are affected by CVE-2025-7635?
It affects 1 product.
Products include Calix Calix Gigacenter Ont.
How do I fix CVE-2025-7635?
No fix has been published for CVE-2025-7635 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-7635 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7635 exists.
Sources
Also known as GHSA-7rr9-q3x5-6c5c.