CVE-2025-7635

HIGH
2025-09-09 [email protected]
Authentication Bypass Calix Gigacenter Ont
8.7
CVSS 4.0
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CVSS VectorNVD

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
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Mar 28, 2026 - 19:11 vuln.today
PoC Detected
Dec 22, 2025 - 20:01 vuln.today
Public exploit code
CVE Published
Sep 09, 2025 - 20:15 nvd
HIGH 8.7

DescriptionNVD

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

AnalysisAI

Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access. Rated high severity (CVSS 8.7), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access. Affected products include: Calix Calix Gigacenter Ont.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Require authentication for all sensitive operations, implement defense in depth.

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CVE-2025-7635 vulnerability details – vuln.today
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