Overview
CVE-2025-6113 is a critical vulnerability found in the Tenda FH1203 2.0.1.6 network router. This vulnerability, found in the function fromadvsetlanip of the file /goform/AdvSetLanip, allows for buffer overflow attacks. These types of attacks have the potential to compromise system integrity and expose sensitive data, making this vulnerability a serious security concern. Given the ubiquity of Tenda routers, this vulnerability could potentially impact a significant number of systems worldwide, necessitating immediate attention and remediation.
Vulnerability Summary
CVE ID: CVE-2025-6113
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
Tenda FH1203 | 2.0.1.6
How the Exploit Works
The exploit targets the fromadvsetlanip function within the /goform/AdvSetLanip file of the Tenda FH1203 router. Specifically, the vulnerability arises from the manipulation of the lanMask argument, leading to a buffer overflow. By sending an overly large packet of data to the lanMask argument, an attacker can cause the system to overflow the buffer, corrupting adjacent memory space. This could potentially allow the attacker to execute arbitrary code or cause a denial of service.
Conceptual Example Code
Here’s a conceptual example of how this vulnerability might be exploited. Note that this is a simplified conceptual example and not actual exploit code.
POST /goform/AdvSetLanip HTTP/1.1
Host: target.router.ip
Content-Type: application/x-www-form-urlencoded
lanMask=255.255.255.255&oversizedData=[...]In this example, the “oversizedData” stands for the excessive amount of data that causes the buffer overflow.
Mitigation and Recommendations
Users of affected Tenda FH1203 routers are strongly advised to apply the vendor patch as soon as possible. In the absence of a patch, or as a temporary mitigation, firewalls or intrusion detection systems (IDS) can be configured to detect and block attempts to exploit this vulnerability. Users should also consider enabling automatic updates to ensure that future patches are applied promptly. Regular monitoring and logging of network traffic can also aid in identifying any potential exploitation attempts.