CVE-2025-14526 identifies a buffer overflow vulnerability in the Tenda CH22 router firmware version 1.0.0.1. The vulnerability resides in the frmL7ImForm function of the /goform/L7Im endpoint, where improper handling of the 'page' argument allows an attacker to overflow a buffer. This flaw can be exploited remotely over the network without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can lead to arbitrary code execution, compromising the device's confidentiality, integrity, and availability. The CVSS 4.0 score of 8.7 reflects the high impact and ease of exploitation, with no privileges or user interaction needed. Although no active exploitation in the wild has been reported, the public release of an exploit increases the likelihood of attacks. The vulnerability affects only version 1.0.0.1 of the firmware, and no official patch links are currently available, indicating that users must rely on vendor updates or mitigations. The flaw could be leveraged to take control of routers, intercept or manipulate network traffic, or disrupt network services, posing significant risks to organizations relying on these devices for network connectivity and security.

For European organizations, this vulnerability poses a significant risk to network infrastructure security. Compromise of Tenda CH22 routers could lead to unauthorized access to internal networks, interception of sensitive data, disruption of network availability, and potential lateral movement within corporate environments. Critical sectors such as finance, healthcare, government, and telecommunications could face severe operational and reputational damage. The remote and unauthenticated nature of the exploit increases the attack surface, especially for organizations with exposed management interfaces or insufficient network segmentation. Given the public availability of an exploit, threat actors may rapidly develop automated attacks targeting vulnerable devices. This could lead to widespread compromise, data breaches, or denial of service conditions impacting business continuity and regulatory compliance under frameworks like GDPR.

Organizations should immediately inventory their network devices to identify any Tenda CH22 routers running firmware version 1.0.0.1. Since no official patch is currently available, network administrators should implement compensating controls such as restricting access to the /goform/L7Im endpoint via firewall rules or access control lists, especially from untrusted networks. Deploy network intrusion detection/prevention systems (IDS/IPS) with signatures tuned to detect exploitation attempts targeting this vulnerability. Disable remote management interfaces if not strictly necessary or restrict them to trusted IP addresses. Monitor network logs for unusual activity related to the vulnerable endpoint. Engage with Tenda support channels to obtain firmware updates or security advisories. Plan for timely firmware upgrades once patches are released. Additionally, segment networks to limit the impact of compromised devices and enforce strong network access controls to prevent lateral movement.