Overview
A severe vulnerability, CVE-2025-10666, that affects the D-Link DIR-825 routers up to version 2.10, has emerged in the cybersecurity landscape. This flaw, found in the function sub_4106d4 of the file apply.cgi, allows for a buffer overflow attack when the argument countdown_time is manipulated. As this exploit can be executed remotely, it poses a serious threat to users of the affected routers, potentially leading to system compromise or data leakage. The fact that the exploit has been made public and affects products that are no longer supported by the maintainer adds to the gravity of the situation.
Vulnerability Summary
CVE ID: CVE-2025-10666
Severity: High (8.8 CVSS Score)
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
D-Link DIR-825 | Up to 2.10
How the Exploit Works
The vulnerability lies within the function sub_4106d4 of the file apply.cgi. The countdown_time argument of this function is improperly validated, allowing for manipulation. An attacker can exploit this flaw by sending specially crafted data to the countdown_time argument that exceeds the buffer size. This causes an overflow of the buffer, which can result in arbitrary code execution, potentially compromising the entire system or leading to data leakage.
Conceptual Example Code
Here is a conceptual HTTP request that might be used to exploit this vulnerability:
POST /apply.cgi HTTP/1.1
Host: target_router_IP
Content-Type: application/x-www-form-urlencoded
countdown_time=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[continued until buffer overflow occurs]In this example, the countdown_time value is filled with an excessive amount of ‘A’ characters, triggering a buffer overflow. This is a simplified representation; in a real-world scenario, the malicious payload could contain carefully crafted machine code to execute specific commands or functions on the target system.
Please remember that this information is for educational purposes only and should not be used with malicious intent.
