EUVD-2025-19052

Comprehensive Technical Analysis of EUVD-2025-19052

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19052 pertains to multiple wireless router models from Sapido. The exposure of sensitive information allows unauthenticated remote attackers to access a system configuration file, which contains plaintext administrator credentials. This vulnerability is severe due to the following factors:

• Unauthenticated Access: Attackers do not need any credentials to exploit this vulnerability.
• Remote Exploitation: The attack can be carried out over the network, increasing the potential attack surface.
• Sensitive Information Exposure: The exposure of plaintext administrator credentials can lead to full compromise of the device and potentially the network it is connected to.

The CVSS (Common Vulnerability Scoring System) base score of 9.3 (version 4.0) indicates a critical severity level. The vector string CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N breaks down as follows:

• Attack Vector (AV:N): Network
• Attack Complexity (AC:L): Low
• Authentication (AT:N): None
• Privileges Required (PR:N): None
• User Interaction (UI:N): None
• Confidentiality Impact (VC:H): High
• Integrity Impact (VI:H): High
• Availability Impact (VA:H): High
• Scope Change (SC:N): None
• Scope Impact (SI:N): None
• Scope Availability (SA:N): None

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector is through network access. An attacker can exploit this vulnerability by:

• Network Scanning: Identifying vulnerable Sapido routers on the network.
• Direct Access: Accessing the configuration file directly via the network without authentication.
• Credential Harvesting: Extracting plaintext administrator credentials from the configuration file.

Once the credentials are obtained, the attacker can:

• Gain Administrative Access: Log in to the router with administrative privileges.
• Network Compromise: Use the router as a pivot point to attack other devices on the network.
• Data Exfiltration: Exfiltrate sensitive data or install malware on the network.

3. Affected Systems and Software Versions

The affected systems include multiple models of Sapido wireless routers. The specific models and versions are:

• BR270n (Version 0)
• BRE70n (Version 0)
• BRC70x (Version 0)
• BR261c (Version 0)
• BRE71n (Version 0)
• BRF71n (Version 0)
• BRD70n (Version 0)
• BRC70n (Version 0)
• BR071n (Version 0)
• BRC76n (Version 0)
• BR476n (Version 0)
• BRF61c (Version 0)

All these models are out of support, which means no patches or updates will be provided by the vendor.

4. Recommended Mitigation Strategies

Given that the affected models are out of support, the primary mitigation strategy is to replace the devices with supported and secure alternatives. Additional mitigation strategies include:

• Network Segmentation: Isolate vulnerable routers from critical network segments.
• Firewall Rules: Implement strict firewall rules to limit access to the routers.
• Monitoring: Increase monitoring of network traffic to detect any suspicious activity.
• User Education: Educate users about the risks and the importance of replacing outdated devices.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly for organizations and individuals using the affected Sapido routers. The potential for unauthenticated remote access to sensitive information can lead to widespread compromise of networks, data breaches, and further cyber-attacks. The lack of vendor support for these devices exacerbates the risk, as there is no patch available to mitigate the vulnerability.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Detection: Implement network intrusion detection systems (NIDS) to monitor for unauthorized access attempts to the configuration files of Sapido routers.
• Logging: Enable comprehensive logging on network devices to capture any suspicious activity.
• Incident Response: Develop an incident response plan that includes steps for identifying and isolating compromised routers.
• Replacement: Prioritize the replacement of affected routers with models that are supported and receive regular security updates.
• Communication: Inform stakeholders about the vulnerability and the need for immediate action to mitigate risks.

Conclusion

The vulnerability described in EUVD-2025-19052 is critical and requires immediate attention. Organizations and individuals using the affected Sapido router models should prioritize replacing these devices to mitigate the risk of unauthenticated remote access and potential network compromise. Enhanced monitoring, network segmentation, and user education are additional steps that can help reduce the overall risk until the devices are replaced.

References

• TW-CERT Advisory 1
• TW-CERT Advisory 2

Alias

• CVE-2025-6560

Assigner

• twcert

EPSS

• N/A

ENISA ID Product and Vendor

• Products: BR270n, BRE70n, BRC70x, BR261c, BRE71n, BRF71n, BRD70n, BRC70n, BR071n, BRC76n, BR476n, BRF61c
• Vendor: Sapido