CVE-2025-14139 is a buffer overflow vulnerability identified in the UTT 进取 520W device, version 1.7.7-180627. The vulnerability arises from unsafe use of the strcpy function in the /goform/formConfigDnsFilterGlobal endpoint, where the timeRangeName parameter is not properly validated or bounded. This allows an attacker with low privileges (PR:L) and remote access (AV:A) to send a specially crafted request that overflows the buffer, potentially overwriting adjacent memory. The vulnerability does not require user interaction (UI:N) and does not compromise confidentiality or integrity directly but can cause high impact on availability (VA:H), such as device crashes or reboots, leading to denial of service. The exploitability is considered low complexity (AC:L), and the vulnerability scope is unchanged (S:N). The vendor was notified early but has not issued any patches or advisories, and although exploit code has been publicly disclosed, no active exploitation has been reported. This vulnerability affects network infrastructure devices that may be used in enterprise or industrial environments, posing risks to network stability and availability.

For European organizations, this vulnerability poses a significant risk to network infrastructure stability and availability, especially if the UTT 进取 520W devices are deployed in critical network segments. A successful exploit could lead to denial of service conditions, disrupting business operations and potentially impacting connected services. Given the device’s role in DNS filtering configuration, exploitation could also indirectly affect network traffic management and security policies. The lack of vendor response and patches increases the risk exposure duration. Organizations relying on these devices for DNS filtering or network management may face operational disruptions and increased attack surface until mitigations or updates are applied. The medium CVSS score reflects the balance between exploitability and impact, but the public disclosure of exploit code elevates the urgency for mitigation.

Since no official patches are available, European organizations should implement specific mitigations: 1) Restrict network access to the management interface of the UTT 进取 520W devices, limiting it to trusted administrative networks only. 2) Employ network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data environments. 3) Monitor network traffic for unusual or malformed requests targeting /goform/formConfigDnsFilterGlobal, using intrusion detection or prevention systems with custom signatures. 4) Enforce strict authentication and authorization policies to reduce the risk of low-privilege attackers reaching the vulnerable endpoint. 5) Consider deploying virtual patching via Web Application Firewalls (WAFs) or network firewalls to block exploit attempts. 6) Plan for device replacement or firmware upgrade once a vendor patch becomes available. 7) Conduct regular vulnerability scans and penetration tests focusing on network devices to detect similar issues proactively.