CVE-2025-7635

Name: CVE-2025-7635
Creator: NVD / NIST
Published: 2025-09-09T20:15:50.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2025-7635 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.7/10

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

CVSS 4.0

8.7/10

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.27%

19.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Calix	Calix Gigacenter Ont	All versions
Calix	Calix Gigacenter Ont	844e
Calix	Calix Gigacenter Ont	844g
Calix	Calix Gigacenter Ont	844ge
Calix	Calix Gigacenter Ont	854ge

References

https://fluidattacks.com/advisories/salExploit, Mitigation, Third Party Advisory
https://revers3everything.com/calix-case-five-0-days-five-cves/Third Party Advisory
https://www.calix.comProduct
https://fluidattacks.com/advisories/salExploit, Mitigation, Third Party Advisory

Timeline

Published: Sep 9, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

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.

How severe is CVE-2025-7635?

CVE-2025-7635 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2025-7635?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-7635?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST