CVE-2025-7418 is a critical security vulnerability identified in the Tenda O3V2 device, specifically version 1.0.0.12(3880). The flaw exists in the HTTP daemon component (httpd), within the function fromPingResultGet, which processes the /goform/setPing endpoint. The vulnerability arises from improper handling of the destIP argument, leading to a stack-based buffer overflow condition. This type of vulnerability occurs when more data is written to a buffer located on the stack than it can hold, potentially overwriting adjacent memory and allowing an attacker to execute arbitrary code or cause a denial of service. The attack vector is remote and does not require user interaction or prior authentication, making it highly exploitable. The CVSS 4.0 base score is 8.7, reflecting a high severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The vulnerability impacts confidentiality, integrity, and availability with high scope and impact, as the attacker can potentially gain control over the affected device or disrupt its operation. Although no public exploits are currently reported in the wild, the exploit code has been disclosed, increasing the risk of active exploitation. The absence of patches or mitigation links indicates that affected users must rely on other defensive measures until an official fix is released. The Tenda O3V2 is typically used in networking environments, often for wireless connectivity, and the vulnerability could be leveraged to compromise network infrastructure or pivot to other internal systems.

For European organizations, this vulnerability poses a significant risk, especially for enterprises and service providers relying on Tenda O3V2 devices for network connectivity. Exploitation could lead to unauthorized remote code execution, enabling attackers to intercept or manipulate network traffic, disrupt communications, or use compromised devices as footholds for lateral movement within corporate networks. This could result in data breaches, operational downtime, and potential regulatory non-compliance under GDPR due to loss of data confidentiality and integrity. Critical infrastructure sectors such as telecommunications, manufacturing, and public services that depend on stable network devices are particularly vulnerable. The remote and unauthenticated nature of the exploit increases the threat surface, especially in environments where these devices are exposed to the internet or untrusted networks. Additionally, the lack of available patches may prolong exposure, increasing the window for potential attacks.

Immediate mitigation should focus on network-level controls to limit exposure. Organizations should isolate Tenda O3V2 devices from direct internet access by placing them behind firewalls or VPNs and restricting access to the /goform/setPing endpoint. Implement strict network segmentation to prevent compromised devices from accessing sensitive internal resources. Monitoring network traffic for unusual activity related to the destIP parameter or HTTP requests targeting the vulnerable endpoint can help detect exploitation attempts. Employ intrusion detection/prevention systems (IDS/IPS) with updated signatures to identify and block exploit attempts. Where possible, disable or restrict the functionality of the ping feature on the device if it is not essential. Organizations should engage with Tenda support channels to obtain information on patches or firmware updates and plan for timely deployment once available. Additionally, maintain up-to-date asset inventories to identify all affected devices and prioritize remediation efforts. As a longer-term measure, consider replacing vulnerable devices with more secure alternatives if patching is delayed or unavailable.