
Stored XSS proof-of-concept for PPC (Belden) ONT 2K05X router firmware v1.1.9_206L, with reproduction steps and mitigation guidance for the vulnerable CGI component.
Author : Jeyabalaji
Affected Product Code Base: PPC 2K05X Router - V1.1.9_206L
Tested on : Windows 11
CVE : CVE-2025-70545
A stored cross-site scripting (XSS) vulnerability exists in the web management interface of the PPC (Belden) ONT 2K05X router running firmware v1.1.9_206L. The Common Gateway Interface (CGI) component improperly handles user-supplied input, allowing a remote, unauthenticated attacker to inject arbitrary JavaScript that is persistently stored and executed when the affected interface is accessed.
Web management interface, Common Gateway Interface (CGI)
Input validation and output encoding should be enforced in the CGI component.User-supplied input must be properly sanitized before storage and rendering.