Overview
A critical security vulnerability with a CVSS severity score of 8.8 has been identified in the Tenda FH1202 1.2.0.14(408). This vulnerability, identified as CVE-2025-7527, affects the function fromAdvSetWan in /goform/AdvSetWan. The impact of this vulnerability is significant, potentially leading to system compromise or data leakage. It is worth noting that this vulnerability can be exploited remotely, and the exploit has already been disclosed publicly, leading to an increased risk of potential attacks.
This vulnerability is particularly significant due to the potential severity of its impacts, including the possibility of complete system compromise. This means that an attacker could potentially gain control of an affected system, which could allow for further exploitation, data theft, or even system damage.
Vulnerability Summary
CVE ID: CVE-2025-7527
Severity: Critical (8.8 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System Compromise, Data Leakage
Affected Products
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Product | Affected Versions
Tenda FH1202 | 1.2.0.14(408)
How the Exploit Works
The CVE-2025-7527 vulnerability stems from insufficient bounds checking on the PPPOEPassword argument in the fromAdvSetWan function of the /goform/AdvSetWan file. An attacker can exploit this vulnerability by sending a specially crafted request to the target device. This request would contain an oversized PPPOEPassword argument, leading to a stack-based buffer overflow. This overflow can corrupt memory, allowing an attacker to execute arbitrary code on the target system.
Conceptual Example Code
Below is a conceptual example of how an attacker might exploit this vulnerability, using an HTTP POST request with an oversized PPPOEPassword argument:
POST /goform/AdvSetWan HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
PPPOEPassword=[insert oversized input here]Please note that the above is a conceptual example meant for illustration. The actual malicious payload would be tailored to the specific target environment.
Mitigation
Users are advised to apply the vendor patch as soon as it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure. These systems should be configured to block or alert on unusually large PPPOEPassword values.