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

> Live exploitation tracking for CVE-2025-34143 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-34143

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.3
- **Public exploit available:** Yes
- **Affected products:** ETQ Reliance CG (legacy)
- **Weaknesses:** CWE-288 (Authentication Bypass Using an Alternate Path or Channel); CWE-269 (Improper Privilege Management); CWE-78 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'))

## Description

An authentication bypass vulnerability exists in ETQ Reliance on the CG (legacy) platform. The application allowed login as the privileged internal SYSTEM user by manipulating the username field. The SYSTEM account does not require a password, enabling attackers with network access to the login page to obtain elevated access. Once authenticated, an attacker could achieve remote code execution by modifying Jython scripts within the application. This issue was resolved by introducing stricter validation logic to exclude internal accounts from public authentication workflows in version MP-4583.

## CrowdSec analysis

[CVE-2025-34143](https://euvd.enisa.europa.eu/vulnerability/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.

## Timeline

- 2025-07-22: CVE Published. CVE-2025-34143 is published to NVD.
- 2025-07-24: Rule Released. CrowdSec releases a rule to detect CVE-2025-34143 exploitation attempts against the CrowdSec Network.
- 2025-08-07: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-34143 for the first time.

## References

- https://www.etq.com/product-overview/
- https://slcyber.io/assetnote-security-research-center/how-we-accidentally-discovered-a-remote-code-execution-vulnerability-in-etq-reliance/
- https://www.etq.com/blog/etq-reliance-security-update/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34143.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-34143) follows observed exploitation activity for CVE-2025-34143. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.