Overview
The CVE-2025-9089 vulnerability was discovered in the Tenda AC20 16.03.08.12 router. It affects the “sub_48E628” function of the file “/goform/SetIpMacBind” and is a stack-based buffer overflow vulnerability, which can lead to severe implications such as system compromise and data leakage. This vulnerability is of high concern as it allows remote attacks and the exploit has been publicly disclosed. Any organisation or individual using the Tenda AC20 router should take immediate measures to mitigate its impact.
Vulnerability Summary
CVE ID: CVE-2025-9089
Severity: High (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, data leakage
Affected Products
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Product | Affected Versions
Tenda AC20 | 16.03.08.12
How the Exploit Works
The exploit works by manipulating the argument list of the “sub_48E628” function of the “/goform/SetIpMacBind” file. The manipulation results in a stack-based buffer overflow. The overflow occurs when more data is put into a buffer or holding area, than the buffer can handle. This excess data spills over into other buffers, corrupting or overwriting the valid data held in them. This could potentially lead to arbitrary code execution, thereby compromising the system and leading to data leakage.
Conceptual Example Code
Given the nature of the vulnerability, an attacker might craft a malicious request to the vulnerable endpoint. This could look something similar to the following:
POST /goform/SetIpMacBind HTTP/1.1
Host: target_router_ip
Content-Type: application/x-www-form-urlencoded
arg1=value1&arg2=value2&arg3=...&argN=overflowing_payloadIn this conceptual example, “overflowing_payload” represents a payload that is larger than what the argument buffer in “sub_48E628” can handle, resulting in a stack buffer overflow.
It is important to note that the above is a conceptual representation and the actual exploit may vary based on the specifics of the vulnerability and the target environment. It is also necessary to emphasize the importance of addressing this vulnerability promptly, given its high severity and the potential for significant damage.