CVE-2025-7792 in FH451
Summary
by MITRE • 07/18/2025
A vulnerability was found in Tenda FH451 1.0.0.9. It has been rated as critical. This issue affects the function formSafeEmailFilter of the file /goform/SafeEmailFilter. The manipulation of the argument page leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/23/2025
The vulnerability CVE-2025-7792 represents a critical stack-based buffer overflow in the Tenda FH451 router firmware version 1.0.0.9, specifically within the formSafeEmailFilter function located in the /goform/SafeEmailFilter endpoint. This flaw resides in the web interface management system of the device, making it accessible through standard network protocols. The vulnerability is particularly concerning as it affects a core administrative function responsible for email filtering configurations, which are commonly used by network administrators to control email traffic and security policies. The buffer overflow occurs when processing the page argument parameter, indicating that the application fails to properly validate or limit input length before copying data to a fixed-size stack buffer. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security architectures. The attack vector is remote, meaning an attacker can exploit this vulnerability without physical access to the device, making it particularly dangerous in networked environments where routers are exposed to external networks.
The operational impact of this vulnerability extends beyond simple system compromise, as it provides attackers with the potential to execute arbitrary code on the affected router with the privileges of the web server process. This could enable attackers to gain full administrative control over the device, allowing them to modify network configurations, redirect traffic, install malicious firmware, or use the router as a pivot point for attacking internal network systems. The disclosure of exploit code increases the risk significantly, as it removes the requirement for advanced exploitation techniques and makes the vulnerability accessible to a broader range of threat actors. The vulnerability affects the router's ability to maintain network security boundaries, potentially allowing attackers to establish persistent access points within the network infrastructure. Network segmentation that relies on router security becomes compromised, as the device itself becomes a potential entry vector for attackers seeking to escalate privileges within the network environment.
Mitigation strategies for CVE-2025-7792 should prioritize immediate firmware updates from Tenda, as this represents the most effective solution to address the underlying buffer overflow vulnerability. Organizations should implement network segmentation measures to limit access to administrative interfaces and consider disabling unnecessary web management services when not actively required. The implementation of network monitoring solutions that can detect anomalous traffic patterns or unauthorized access attempts to router management interfaces should be deployed. Security teams should also consider implementing intrusion detection systems that can identify exploitation attempts targeting known router vulnerabilities. Additionally, organizations should enforce strict access controls for router management interfaces, including the use of strong authentication mechanisms and limiting administrative access to trusted network segments. The vulnerability demonstrates the importance of input validation and secure coding practices, particularly in web application components that handle user-supplied data. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence through network infrastructure compromise, highlighting the need for comprehensive network security monitoring and incident response procedures. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other network devices and ensure overall network security posture remains robust against evolving threats.