CVE-2025-5507 in A3002RU
Summary
by MITRE • 06/03/2025
A vulnerability was found in TOTOLINK A3002RU 2.1.1-B20230720.1011. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component MAC Filtering Page. The manipulation of the argument Comment leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 05/09/2026
This vulnerability exists within the TOTOLINK A3002RU router firmware version 2.1.1-B20230720.1011 where the MAC Filtering Page component fails to properly sanitize user input. The specific flaw occurs when processing the Comment argument parameter, which allows malicious actors to inject arbitrary script code into the web interface. This represents a classic cross site scripting vulnerability that enables attackers to execute malicious scripts in the context of a victim's browser session. The vulnerability affects the router's web management interface and can be exploited through remote network access without requiring physical presence or authentication credentials.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the router's web server component. When users submit comments through the MAC filtering page, the system fails to properly escape or filter special characters that could be interpreted as executable script code. This allows an attacker to craft malicious payloads that get stored and subsequently executed whenever the affected page is loaded. The vulnerability manifests as a reflected cross site scripting issue where the malicious content is injected into the web page and executed in the victim's browser context.
From an operational perspective, this vulnerability presents significant security risks to organizations and individuals using the affected router model. An attacker can leverage this flaw to steal session cookies, perform unauthorized configuration changes, or redirect users to malicious websites. The remote exploitability means that threat actors can target vulnerable devices from anywhere on the internet without requiring local network access. The fact that this vulnerability has been publicly disclosed and is known to be exploitable increases the risk exposure significantly. The vendor's lack of response to early disclosure attempts leaves users without official patches or mitigation guidance, creating a prolonged window of vulnerability.
The vulnerability maps directly to CWE-79 which defines Cross-Site Scripting flaws in software applications. This weakness allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to session hijacking, data theft, or unauthorized actions performed on behalf of the victim. The ATT&CK framework categorizes this as a web application attack vector under the technique of code injection, specifically targeting web interfaces to execute malicious code. Organizations should immediately implement network segmentation to isolate affected devices, monitor for suspicious network traffic patterns, and consider disabling unnecessary web management interfaces. Additionally, users should be educated about the risks of accessing router interfaces from untrusted networks and the importance of keeping firmware updated when patches become available.
Security professionals should also conduct network scans to identify all instances of this vulnerable firmware version and implement temporary mitigations such as firewall rules that restrict access to the router's web management interface. The lack of vendor response creates a particularly concerning situation where users face a known vulnerability without official support or remediation paths. Organizations should consider alternative network access methods for router management and implement network monitoring solutions to detect potential exploitation attempts. This vulnerability demonstrates the critical importance of maintaining current firmware versions and having robust vulnerability management processes in place to address such issues promptly.