Overview
The CVE-2025-6627 is a critical vulnerability discovered in TOTOLINK A702R 4.0.0-B20230721.1521, a widely used wireless router. The vulnerability lies in an unknown code of the file /boafrm/formIpv6Setup of the HTTP POST Request Handler component. This vulnerability is particularly serious because it can be exploited remotely, leading to potential system compromise and data leakage.
The impact of this vulnerability is significant. Unpatched devices are at risk of being exploited, potentially leading to unauthorized system access, data corruption, or even complete system control. This vulnerability is not just a threat to individual users, but also to enterprises that use this technology, potentially impacting their operational integrity and data security.
Vulnerability Summary
CVE ID: CVE-2025-6627
Severity: Critical (CVSS: 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
TOTOLINK A702R | 4.0.0-B20230721.1521
How the Exploit Works
The vulnerability is a buffer overflow condition that arises from improper validation of user-supplied data. This happens during the handling of HTTP POST requests where the argument ‘submit-url’ is manipulated. The flaw can be exploited by an attacker by sending an overly long, specially crafted argument to the ‘submit-url’ parameter. This overflow can potentially allow the execution of arbitrary code or cause the application to crash, thus leading to a denial of service.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. This could be a sample HTTP request:
POST /boafrm/formIpv6Setup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... (long string of 'A's)In this example, the ‘submit-url’ argument is filled with an excessively long string of ‘A’s. This can overflow the buffer and potentially allow the attacker to execute arbitrary code or cause the system to crash.
Note: This is a conceptual example and not an actual exploit code. The actual exploit might involve a carefully crafted payload designed to overflow the buffer in a specific way to achieve the desired effect.