CVE-2025-7635

HIGH

Published Sep 9, 2025 Modified Dec 22, 2025 CWE-306

Description

Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.

Is your site exposed to CVE-2025-7635?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.7

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-306 Missing Authentication

Affected Products

Vendor	Product	Versions
calix	calix_gigacenter_ont	All
calix	calix_gigacenter_ont	All
calix	calix_gigacenter_ont	All
calix	calix_gigacenter_ont	All
calix	calix_gigacenter_ont	All

References

Exploits

https://fluidattacks.com/advisories/sal https://fluidattacks.com/advisories/sal

Other References

https://revers3everything.com/calix-case-five-0-days-five-cves/ https://www.calix.com

Frequently Asked Questions

What is CVE-2025-7635? +

Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE. It has a CVSS v3.1 base score of 7.7 (HIGH).

How severe is CVE-2025-7635? +

CVE-2025-7635 has a CVSS v3.1 score of 7.7 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-7635? +

CVE-2025-7635 affects products from calix, specifically: calix_gigacenter_ont. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-7635? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-6369

An improper access control vulnerability in the canonical-livepatch snap client prior to version 10.15.0 allows a local unprivileged user to …

CVE-2026-9152

A missing authentication vulnerability exists in the Altium 365 SearchService. A legacy SOAP endpoint exposes search index operations without requiring …

CVE-2026-5749

Inadequate access control in the registration process in Fullstep V5, which could allow unauthenticated users to obtain a valid JWT …

CVE-2026-6376

A weakness in SpiceJet’s public booking retrieval page permits full passenger booking details to be accessed using only a PNR …

CVE-2024-45483

A Missing Authentication for Critical Function vulnerability in the GRUB configuration used B&R APROL <4.4-01 may allow an unauthenticated physical …

CVE-2024-54013

Penetration Testing engineers at Amazon have identified a security flaw related to request handling in the web server component that …