Vulnerability · Published Sep 9, 2025 · Assigned by Fluid Attacks
CVE-2025-7635Calix GigaCenter ONT - Unauthenticated Telnet
High 8.7
In plain English
A high-severity missing authentication in GigaCenter ONT from Calix. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 70.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Calix | GigaCenter ONT | 844E844G844GE854GE |
Weakness: CWE-306 · Vector: 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
References
- https://fluidattacks.com/advisories/sal third-party-advisory
- https://www.calix.com product, related
- https://revers3everything.com/calix-case-five-0-days-five-cves/ third-party-advisory