🛡️ CVE-2025-7635 — calix-gigacenter-ont

🟠 CVSS 7.7 — High ⚠️ Exploit Public CWE-306 NVD
7.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2025-7635 is classified as CWE-306: Missing Authentication for Critical Function. A sensitive function can be reached without authenticating at all.

Affected software

CVE-2025-7635 is recorded against 1 package.

  • calix-gigacenter-ont

Timeline and source

Published on 9 September 2025 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

fluidattacks.com
revers3everything.com
www.calix.com
fluidattacks.com

Details

Severity HIGH
CVSS Score 7.7
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-306
Public Exploit ⚠️ Yes
Source NVD
Published 2025-09-09
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
calix-gigacenter-ont — —

References

Exploit, Mitigation, Third Party Advisory https://fluidattacks.com/advisories/sal
Exploit, Mitigation, Third Party Advisory https://fluidattacks.com/advisories/sal

Exploit Protection

Are you running calix-gigacenter-ont?

CVE-2025-7635 carries CVSS 7.7 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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