CVE-2025-4852 in A3002R
Summary
by MITRE • 05/18/2025
A vulnerability, which was classified as problematic, has been found in TOTOLINK A3002R 2.1.1-B20230720.1011. This issue affects some unknown processing of the component VPN Page. The manipulation of the argument Comment leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 05/18/2025
This vulnerability resides within the TOTOLINK A3002R router firmware version 2.1.1-B20230720.1011, specifically affecting the VPN Page component. The flaw represents a classic cross-site scripting vulnerability that stems from inadequate input validation and sanitization within the web interface. The vulnerability is triggered when an attacker manipulates the Comment argument parameter, which is processed without proper security controls, allowing malicious script execution within the context of a user's browser session.
The technical implementation of this vulnerability falls under CWE-79, which specifically addresses cross-site scripting flaws in web applications. This weakness allows attackers to inject malicious scripts that can execute in the victim's browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability's remote exploitability means that attackers do not require physical access to the device, making it particularly dangerous in networked environments where the router's web interface is accessible from external networks.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable sophisticated attack chains that align with ATT&CK technique T1566 for initial access and T1071 for application layer protocol usage. An attacker could leverage this vulnerability to establish persistent access to the network, potentially escalating privileges or using the compromised router as a pivot point for further attacks. The public disclosure of the exploit increases the risk profile significantly, as it provides threat actors with readily available tools to target affected devices without requiring advanced exploitation techniques.
Mitigation strategies should prioritize immediate firmware updates from TOTOLINK to address the root cause of the vulnerability. Network segmentation and firewall rules can help limit exposure of the router's web interface to untrusted networks. Implementing proper input validation and output encoding mechanisms within the application code would prevent similar issues in future deployments. Additionally, network monitoring should be enhanced to detect unusual traffic patterns that might indicate exploitation attempts, while user education regarding the dangers of visiting untrusted websites or clicking suspicious links remains crucial for overall security posture.