Overview
A critical vulnerability, officially designated as CVE-2025-7548, has been discovered in the Tenda FH1201 1.2.0.14(408). This exploit affects the function formSafeEmailFilter of the file /goform/SafeEmailFilter. The vulnerability exposes a serious risk to all users of the affected product, due to the potential for remote initiation of an attack that could lead to a system compromise or data leakage. Given the critical severity classification, the immediate application of mitigating measures is recommended to minimize potential risks.
Vulnerability Summary
CVE ID: CVE-2025-7548
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda FH1201 | 1.2.0.14(408)
How the Exploit Works
The exploitation of this vulnerability involves the manipulation of the argument ‘page’ within the function formSafeEmailFilter. This manipulation triggers a stack-based buffer overflow condition. A buffer overflow occurs when more data is written into a buffer than it can handle, causing the excess data to overflow into adjacent memory spaces. This can lead to unpredictable program behavior, including memory access errors, incorrect results, program termination (a crash), or a breach of system security. In this case, an attacker could use this vulnerability to execute arbitrary code, compromising the system or causing data leakage.
Conceptual Example Code
Below is a
conceptual
example of how the vulnerability might be exploited. This is a sample HTTP request that may be used to trigger the buffer overflow condition:
POST /goform/SafeEmailFilter HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
page=A*5000In this example, ‘A*5000’ represents a string of 5000 ‘A’ characters. If the implementation of ‘formSafeEmailFilter’ function does not properly limit or check the size of the ‘page’ argument, this could cause a buffer overflow condition.
Mitigation Guidance
To mitigate this vulnerability, it is recommended to apply the vendor patch as soon as it is available. In the meantime, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can help detect and prevent exploitation attempts. Always ensure your systems are updated regularly and security best practices are followed to prevent exploitation of such vulnerabilities.