Overview
This blog post provides a detailed analysis for CVE-2025-4897, a critical vulnerability discovered in Tenda A15 versions 15.13.07.09/15.13.07.13. This vulnerability is of high significance due to its critical CVSS Severity Score of 8.8, indicating the potential for significant damage if exploited. The vulnerability affects an unknown part of the /goform/multimodalAdd file and is associated with the HTTP POST Request Handler component. The risk is further amplified by the vulnerability’s public disclosure, which means potential attackers may already be prepared to exploit it.
Vulnerability Summary
CVE ID: CVE-2025-4897
Severity: Critical – 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 A15 | 15.13.07.09, 15.13.07.13
How the Exploit Works
The vulnerability lies within the HTTP POST Request Handler component of Tenda A15. An attacker can manipulate this vulnerability to cause a buffer overflow condition by sending a specially crafted HTTP POST request to the /goform/multimodalAdd file. This buffer overflow allows the attacker to overwrite memory locations, potentially leading to arbitrary code execution or denial of service, thereby compromising the entire system or leading to potential data leakage.
Conceptual Example Code
This is a conceptual example of how the vulnerability might be exploited using an HTTP POST request. The request contains a “malicious_payload” in the body of the message that triggers the buffer overflow.
POST /goform/multimodalAdd HTTP/1.1
Host: vulnerable-system.example.com
Content-Type: application/x-www-form-urlencoded
malicious_payload=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, the “malicious_payload” is an excessively long string of “A”s that causes the buffer overflow. In a real-world attack, this payload could contain malicious code that gets executed on the target system.
Mitigation Guidance
Given the severity of this vulnerability, we recommend applying the vendor patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. It’s also advisable to monitor network traffic for any unusual activity, especially HTTP POST requests to the /goform/multimodalAdd file.