CVE-2025-14526 is a buffer overflow vulnerability identified 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 type of memory corruption can lead to arbitrary code execution, potentially granting the attacker control over the device. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, making it particularly dangerous. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no privileges required. The exploit code has been publicly released, which increases the likelihood of exploitation attempts. Although no active exploitation has been reported yet, the presence of a public exploit significantly raises the threat level. The vulnerability affects only version 1.0.0.1 of the Tenda CH22 firmware, so devices running other versions or different models are not impacted. The lack of an official patch at the time of disclosure means organizations must rely on network-level mitigations or device isolation until a firmware update is available. Given the critical role routers play in network infrastructure, successful exploitation could allow attackers to intercept, modify, or disrupt network traffic, leading to data breaches, service outages, or further network compromise.

For European organizations, the impact of CVE-2025-14526 could be significant. Compromised Tenda CH22 routers could serve as entry points for attackers to infiltrate internal networks, intercept sensitive communications, or launch further attacks such as lateral movement or data exfiltration. The confidentiality of corporate and personal data could be severely compromised, especially in sectors relying on secure communications like finance, healthcare, and government. Integrity of network traffic could be undermined, enabling attackers to manipulate data or inject malicious payloads. Availability may also be affected if attackers disrupt router functionality, causing network outages or degraded performance. Given the remote exploitability without authentication, attackers can target vulnerable devices en masse, increasing the risk of widespread disruption. European organizations with limited network segmentation or outdated device inventories are particularly vulnerable. The public availability of exploit code lowers the barrier for attackers, including less skilled threat actors, to attempt exploitation. This elevates the urgency for European entities to assess their exposure and implement mitigations promptly.

1. Immediately inventory all Tenda CH22 devices within the network and verify firmware versions. 2. Apply the vendor-released firmware update as soon as it becomes available; monitor Tenda's official channels for patch announcements. 3. Until patches are deployed, restrict access to the /goform/L7Im endpoint by implementing firewall rules or access control lists (ACLs) that block external and untrusted internal network traffic to the device management interfaces. 4. Employ network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data environments. 5. Monitor network traffic for unusual patterns or attempts to access the vulnerable endpoint, using intrusion detection/prevention systems (IDS/IPS) with updated signatures. 6. Disable remote management features on Tenda CH22 devices if not explicitly required. 7. Educate IT staff about the vulnerability and the importance of rapid patching and network hygiene. 8. Consider replacing legacy or unsupported devices with models that receive regular security updates. 9. Conduct regular vulnerability scans to detect unpatched devices and verify mitigation effectiveness. 10. Establish incident response procedures to quickly address any detected exploitation attempts.