CVE-2025-50613 in WF2880
Summary
by MITRE • 08/13/2025
A buffer overflow vulnerability has been discovered in Netis WF2880 v2.1.40207 in the FUN_00475e1c function of the cgitest.cgi file. Attackers can trigger this vulnerability by controlling the value of wds_key_wep in the payload, which can cause the program to crash and potentially lead to a Denial of Service (DoS) attack.
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Analysis
by VulDB Data Team • 08/14/2025
This buffer overflow vulnerability exists within the Netis WF2880 router firmware version 2.1.40207, specifically within the cgitest.cgi component where the FUN_00475e1c function fails to properly validate input parameters. The vulnerability manifests when an attacker manipulates the wds_key_wep parameter in a crafted payload, allowing for arbitrary memory overwrite conditions that can compromise the device's stability and operational integrity. The flaw represents a classic stack-based buffer overflow scenario where insufficient bounds checking enables attackers to write beyond allocated memory boundaries, potentially leading to program termination or unauthorized code execution.
The technical implementation of this vulnerability stems from improper input validation within the cgi script processing logic, where user-supplied data from the wds_key_wep parameter is directly copied into a fixed-size buffer without adequate length verification. This condition creates an exploitable condition that aligns with CWE-121 Stack-based Buffer Overflow, where the function fails to enforce buffer size limitations during data transfer operations. The vulnerability operates at the application layer of the network stack, making it accessible through standard web-based attack vectors that target the device's web management interface.
From an operational perspective, this vulnerability presents a significant risk to network availability and security posture, as successful exploitation can result in sustained denial of service conditions that prevent legitimate users from accessing router management functions. The impact extends beyond simple service disruption since the device may become unresponsive to legitimate administrative commands, potentially requiring physical intervention or firmware reinstallation to restore functionality. Network administrators face the challenge of maintaining service availability while addressing the underlying security flaw that could be leveraged by malicious actors to disrupt network operations.
Mitigation strategies should prioritize immediate firmware updates from Netis to address the identified buffer overflow condition, as the vendor has likely released patches that implement proper input validation and memory boundary checks. Network segmentation and access control measures can provide additional defense-in-depth layers by restricting access to the router management interface to trusted administrative networks only. Implementing web application firewalls and monitoring for unusual parameter patterns in web requests can help detect potential exploitation attempts. The vulnerability also highlights the importance of regular security assessments and firmware update policies, as organizations should maintain awareness of known vulnerabilities within their network infrastructure components and establish procedures for rapid response to security advisories. This case demonstrates how seemingly minor input validation flaws can create significant operational risks that require coordinated remediation efforts across network security and operations teams.