CVE-2025-4141 in EX6200
Summary
by MITRE • 05/01/2025
A vulnerability, which was classified as critical, was found in Netgear EX6200 1.0.3.94. This affects the function sub_3C03C. The manipulation of the argument host leads to buffer overflow. It is possible to initiate the attack 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 • 05/01/2025
The vulnerability identified as CVE-2025-4141 represents a critical buffer overflow flaw within the Netgear EX6200 router firmware version 1.0.3.94. This issue resides in the sub_3C03C function and specifically targets the host argument handling mechanism. The buffer overflow vulnerability occurs when improper input validation allows an attacker to exceed the allocated memory buffer space, potentially leading to arbitrary code execution or system compromise. The affected device operates as a wireless router and access point, making it a prime target for network-based attacks that could escalate to full system control.
The technical exploitation of this vulnerability demonstrates a classic buffer overflow condition where the host argument parameter lacks proper bounds checking before being processed by the sub_3C03C function. This flaw falls under CWE-121, which describes stack-based buffer overflow conditions, and may also relate to CWE-122 for heap-based buffer overflows depending on the specific memory allocation patterns. The remote attack vector indicates that no physical access or local network credentials are required to exploit this vulnerability, making it particularly dangerous for widespread deployment. The attack can be initiated through network packets sent to the router's management interface or web server, potentially allowing an attacker to inject malicious code into the device's memory space.
From an operational standpoint, this vulnerability presents significant risks to network security infrastructure since the Netgear EX6200 serves as a primary gateway device for many home and small office networks. The remote exploit capability means that attackers can compromise these devices from anywhere on the internet, potentially gaining access to internal network resources, intercepting communications, or using the compromised router as a pivot point for further attacks. The lack of vendor response to early disclosure attempts creates a dangerous gap in security remediation, leaving affected networks exposed for extended periods without official patches or mitigation guidance. This vulnerability directly aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1021.001 for remote services, as it enables unauthorized remote code execution and network access.
Security professionals should immediately implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Network monitoring should be enhanced to detect unusual traffic patterns or attempts to access the router's administrative interfaces. The absence of vendor response necessitates the deployment of intrusion detection systems and network firewalls to block access to vulnerable ports and services. Organizations should consider implementing temporary workarounds such as disabling remote management features or using alternative network access methods until official patches are available. The vulnerability's classification as critical according to CVSS v3.1 scoring reflects the potential for severe impact, including complete system compromise, data exfiltration, and network infiltration. Given the remote exploitability and lack of vendor response, immediate defensive measures are essential to protect against potential exploitation attempts.