Reliance CG (legacy) - RCE (CVE-2025-34143)

CVE-2025-34143 is a critical authentication bypass vulnerability in ETQ Reliance CG (legacy), where attackers can log in as the privileged SYSTEM user simply by manipulating the username field, as this account does not require a password. With network access to the login page, threat actors can gain elevated privileges and potentially achieve remote code execution by altering Jython scripts within the application. This flaw poses a significant risk of full system compromise until patched.

CrowdSec has been tracking this vulnerability and its exploits since 24th of July 2025.

Data from the CrowdSec community indicates that exploitation of CVE-2025-34143 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2025-34143 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers exploit the authentication endpoint /reliance/resources/sessions by sending specially crafted POST requests to bypass authentication and gain SYSTEM-level access.