CVE-2025-15459 is a buffer overflow vulnerability identified in the UTT 进取 520W device firmware version 1.7.7-180627. The vulnerability arises from unsafe use of the strcpy function in the /goform/formUser endpoint, specifically when processing the passwd1 parameter. Because strcpy does not perform bounds checking, an attacker can supply an overly long passwd1 argument, causing a buffer overflow. This overflow can corrupt memory, potentially allowing remote attackers to execute arbitrary code or crash the device, leading to denial of service. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The vendor was contacted early but has not responded or released a patch, and exploit code has been publicly disclosed, increasing the likelihood of exploitation. The CVSS 4.0 score is 8.7, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction needed. This vulnerability affects a specific firmware version of the UTT 进取 520W, a networking device commonly used in certain markets. The lack of vendor response and public exploit availability make this a critical concern for organizations using this device.

For European organizations, exploitation of CVE-2025-15459 could result in unauthorized remote code execution, allowing attackers to take control of affected devices. This could lead to interception or manipulation of network traffic, disruption of network services, and potential lateral movement within corporate networks. Critical infrastructure sectors relying on UTT 进取 520W devices could experience outages or data breaches, impacting operational continuity and data confidentiality. The vulnerability's remote exploitability without authentication increases the risk of widespread attacks, especially in environments where these devices are exposed to untrusted networks. The absence of a vendor patch exacerbates the threat, forcing organizations to rely on compensating controls. The potential impact includes loss of sensitive data, service downtime, and reputational damage, particularly for industries with stringent regulatory requirements such as finance, healthcare, and government entities in Europe.

1. Immediately isolate UTT 进取 520W devices running firmware version 1.7.7-180627 from untrusted networks to prevent remote exploitation. 2. Implement network segmentation and firewall rules to restrict access to the /goform/formUser endpoint, allowing only trusted management IPs. 3. Monitor network traffic for anomalous requests targeting passwd1 parameters or unusual payload sizes indicative of buffer overflow attempts. 4. Deploy intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics tuned to detect exploitation attempts against this vulnerability. 5. Engage with UTT or authorized resellers to obtain firmware updates or patches; if unavailable, consider device replacement or vendor alternatives. 6. Harden device configurations by disabling unnecessary services and enforcing strong access controls. 7. Conduct regular vulnerability assessments and penetration tests focusing on network devices to identify similar issues. 8. Maintain comprehensive logging and alerting to detect exploitation attempts promptly. 9. Educate IT and security teams about this specific vulnerability and its exploitation vectors to improve incident response readiness.