CVE-2025-4116 in JWNR2000v2
Summary
by MITRE • 04/30/2025
A vulnerability, which was classified as critical, has been found in Netgear JWNR2000v2 1.0.0.11. Affected by this issue is the function get_cur_lang_ver. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 04/30/2025
The vulnerability identified as CVE-2025-4116 represents a critical buffer overflow flaw within the Netgear JWNR2000v2 wireless router firmware version 1.0.0.11. This issue specifically affects the get_cur_lang_ver function which processes the host argument, creating a dangerous condition where malicious input can exceed the allocated buffer space. The flaw resides in the router's web interface handling mechanism, where insufficient input validation allows attackers to craft specially crafted payloads that trigger memory corruption. The buffer overflow vulnerability occurs when the host parameter is manipulated beyond the expected buffer boundaries, potentially allowing arbitrary code execution or system compromise. This critical vulnerability affects the device's authentication and configuration interfaces, making it a significant threat to network security.
The technical exploitation of this buffer overflow vulnerability follows established patterns documented in CWE-121, which describes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector is remotely accessible, meaning an attacker does not require physical access to the device or network proximity to exploit the vulnerability. The flaw demonstrates characteristics consistent with CWE-79, which covers cross-site scripting vulnerabilities, as the host parameter processing could enable malicious input injection. The remote attack capability aligns with ATT&CK technique T1190, which involves exploiting vulnerabilities in network infrastructure devices to gain unauthorized access to network resources. The vulnerability's classification as critical indicates the potential for complete system compromise, denial of service, or data exfiltration.
The operational impact of this vulnerability extends beyond simple device compromise, as the JWNR2000v2 serves as a primary network gateway for numerous residential and small business networks. When exploited, the buffer overflow could enable attackers to gain root access to the router's operating system, allowing for persistent backdoor installation, traffic interception, or complete network takeover. The lack of vendor response to early disclosure attempts compounds the security risk, leaving affected networks exposed without official patches or mitigation guidance. Network administrators should consider the potential for lateral movement within compromised networks, as routers often serve as trusted network entry points for internal systems. The vulnerability's remote exploitability means that attackers can target multiple devices simultaneously from the internet without requiring local network access, making it particularly dangerous for organizations with exposed router interfaces.
Mitigation strategies for CVE-2025-4116 should include immediate network segmentation to isolate affected devices from critical infrastructure, implementation of network monitoring to detect exploitation attempts, and deployment of intrusion detection systems with signatures for buffer overflow patterns. Organizations should disable unnecessary services on the router, particularly web interfaces that expose the vulnerable get_cur_lang_ver function. The most effective long-term solution involves firmware updates from Netgear, though the vendor's lack of response creates an urgent need for alternative security measures. Network administrators should consider implementing network access controls to restrict remote access to router management interfaces and establish regular firmware update procedures. Additionally, the vulnerability highlights the importance of maintaining up-to-date security patches and implementing proper network monitoring to detect anomalous traffic patterns that may indicate exploitation attempts. The absence of vendor response underscores the necessity of proactive security measures and the potential risks associated with unsupported network devices in enterprise environments.