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CVE-2025-56752: Critical Authentication Bypass Vulnerability in Ruijie RG-ES Series Switch Firmware

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Overview

The cybersecurity world is abuzz with news of a significant vulnerability identified in the Ruijie RG-ES series switch firmware ESW_1.0(1)B1P39. This vulnerability, assigned the identifier CVE-2025-56752, has the potential to allow remote attackers unrestricted access to targeted devices. This could lead to drastic consequences, including the possible commandeering of affected systems and potential data leakage.
This vulnerability poses a serious threat to organizations that rely on the Ruijie RG-ES series switches for their network infrastructure. Given the severity of the potential impact, it’s of utmost importance to understand this vulnerability and implement the necessary mitigations.

Vulnerability Summary

CVE ID: CVE-2025-56752
Severity: Critical, CVSS score 9.4
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Full system compromise and potential data leakage

Affected Products

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Product | Affected Versions

Ruijie RG-ES Series Switch | ESW_1.0(1)B1P39

How the Exploit Works

The exploit takes advantage of a vulnerability in the authentication mechanism of the RG-ES series switches’ firmware. By crafting a malicious HTTP POST request to /user.cgi, an attacker can bypass the authentication process entirely. This allows them direct and unrestricted access to the administrative settings of the device.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP POST request that could exploit this vulnerability. The actual malicious payload would depend on the attacker’s goal.

POST /user.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
username=admin&password=123456&submit=Login

Once the request is made, the attacker gains full access to the targeted device, bypassing the usual authentication process.

Recommendations for Mitigation

The most effective mitigation for this vulnerability is to apply the vendor-supplied patch. If the patch cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary measure to detect and block attacks exploiting this vulnerability. However, these are temporary measures and do not substitute for the application of the patch, which is necessary to fully resolve the vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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