CVE-2025-4354 is a critical stack-based buffer overflow vulnerability identified in the Tenda DAP-1520 wireless access point, specifically affecting firmware version 1.10B04_BETA02. The flaw resides in the function check_dws_cookie within the /storage component of the device's firmware. This vulnerability allows an attacker to remotely manipulate input data that is processed by this function, leading to a stack-based buffer overflow condition. Such an overflow can corrupt adjacent memory on the stack, potentially enabling arbitrary code execution, denial of service, or system compromise. The vulnerability is exploitable remotely without requiring user interaction or prior authentication, as indicated by the CVSS vector (AV:N/AC:L/AT:N/UI:N/PR:L). The CVSS 4.0 base score of 8.7 classifies this as a high-severity issue, reflecting the significant impact on confidentiality, integrity, and availability if exploited. Although no public exploit is currently known to be in widespread use, the exploit code has been disclosed publicly, increasing the risk of imminent exploitation by threat actors. The vulnerability affects a specific firmware version, suggesting that devices running this or earlier vulnerable versions are at risk until patched or mitigated. The absence of official patch links in the provided data indicates that a vendor fix may not yet be available, necessitating immediate risk management measures by affected organizations.

For European organizations, the impact of this vulnerability can be substantial, particularly for enterprises and service providers relying on Tenda DAP-1520 access points for network connectivity. Successful exploitation could lead to unauthorized remote code execution, allowing attackers to gain control over the affected device. This could facilitate lateral movement within the network, data exfiltration, or disruption of network services. Given that the vulnerability requires no user interaction and can be triggered remotely, it poses a high risk of automated exploitation campaigns. Critical infrastructure, government agencies, and businesses with sensitive data could face confidentiality breaches, operational downtime, and reputational damage. Moreover, compromised access points could be leveraged as entry points for broader attacks against internal networks. The high severity and ease of exploitation underscore the urgency for European organizations to assess their exposure and implement mitigations promptly.

1. Immediate firmware upgrade: Organizations should verify the firmware version of their Tenda DAP-1520 devices and upgrade to the latest vendor-released version that addresses this vulnerability once available. 2. Network segmentation: Isolate vulnerable access points on separate network segments with strict access controls to limit potential lateral movement in case of compromise. 3. Access control: Restrict remote management interfaces of the affected devices to trusted IP addresses and disable any unnecessary remote access protocols. 4. Intrusion detection and prevention: Deploy network-based IDS/IPS solutions configured to detect anomalous traffic patterns or known exploit signatures targeting this vulnerability. 5. Monitoring and logging: Enable detailed logging on affected devices and monitor for unusual activity indicative of exploitation attempts. 6. Temporary workaround: If a patch is unavailable, consider disabling or restricting the functionality related to the check_dws_cookie function if feasible, or replace vulnerable devices with alternative hardware. 7. Vendor engagement: Maintain communication with Tenda for timely updates and patches, and subscribe to security advisories related to their products.