CVE-2025-5671 in N302R Plus
Summary
by MITRE • 06/05/2025
A vulnerability, which was classified as critical, was found in TOTOLINK N302R Plus up to 3.4.0-B20201028. Affected is an unknown function of the file /boafrm/formPortFw of the component HTTP POST Request Handler. The manipulation of the argument service_type leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 06/06/2025
This critical vulnerability resides within the TOTOLINK N302R Plus router firmware version 3.4.0-B20201028 and earlier, specifically targeting the HTTP POST Request Handler component. The flaw manifests in the /boafrm/formPortFw file where an uncontrolled buffer overflow occurs when processing the service_type argument. This vulnerability represents a classic buffer overflow condition that allows attackers to write beyond the allocated memory boundaries, potentially leading to arbitrary code execution or system compromise. The attack vector is remote, meaning an attacker can exploit this weakness without physical access to the device, making it particularly dangerous in networked environments.
The technical implementation of this vulnerability stems from inadequate input validation within the HTTP POST request handling mechanism. When the service_type parameter is processed, the application fails to properly check the length of user-supplied data against the allocated buffer size, creating a condition where malicious input can overwrite adjacent memory locations. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-787, which covers out-of-bounds write conditions. The vulnerability's classification as critical by security researchers indicates the severity of potential impact, including complete system compromise and unauthorized access to network resources.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass full network infiltration capabilities. An attacker exploiting this buffer overflow could gain administrative privileges on the router, potentially leading to man-in-the-middle attacks, DNS hijacking, or the establishment of persistent backdoors within the network infrastructure. The public disclosure of the exploit means that threat actors can readily leverage this weakness without requiring advanced technical skills or custom development. This exposure creates significant risk for organizations and individuals who rely on these devices for network security, as compromised routers can serve as entry points for broader network attacks.
Mitigation strategies for this vulnerability must prioritize immediate firmware updates from TOTOLINK to address the buffer overflow condition in the HTTP POST handler. Network administrators should implement strict access controls and monitor network traffic for signs of exploitation attempts, particularly targeting the affected router's HTTP ports. The implementation of network segmentation and firewall rules can help limit the potential impact if exploitation occurs, while regular security assessments should verify that all network devices have been updated to secure firmware versions. Additionally, organizations should consider deploying intrusion detection systems that can identify suspicious HTTP POST requests targeting known vulnerable components, aligning with ATT&CK framework techniques related to exploitation of remote services and credential access through network infrastructure compromise.