EUVD-2025-17672

Comprehensive Technical Analysis of EUVD-2025-17672

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-17672 pertains to a Deserialization of Untrusted Data issue in the CozyStay theme developed by LoftOcean. This vulnerability allows for Object Injection, which can lead to severe security implications. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable over the network.
• Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
• Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required for the attack to succeed.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect other systems or components.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

Given these metrics, the vulnerability poses a significant risk to systems running the affected software.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is the deserialization of untrusted data, which can be exploited through:

• Remote Code Execution (RCE): An attacker could craft a malicious payload that, when deserialized, executes arbitrary code on the server.
• Data Exfiltration: Sensitive data could be extracted by injecting objects that manipulate the application's data flow.
• Denial of Service (DoS): Injecting objects that cause the application to crash or become unresponsive.

Exploitation methods typically involve sending specially crafted input to the application, which is then deserialized without proper validation. This could be achieved through HTTP requests, file uploads, or other input mechanisms.

3. Affected Systems and Software Versions

The vulnerability affects the CozyStay theme by LoftOcean, specifically versions prior to 1.7.1. Any system running this theme within the specified version range is at risk. This includes:

• WordPress installations using the CozyStay theme.
• Any web applications or services that integrate with the CozyStay theme.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Update to the Latest Version: Ensure that all instances of the CozyStay theme are updated to version 1.7.1 or later.
• Input Validation: Implement robust input validation and sanitization to prevent untrusted data from being deserialized.
• Use Secure Deserialization Libraries: Utilize libraries that provide secure deserialization mechanisms.
• Network Security: Implement network security measures such as firewalls and intrusion detection systems to monitor and block suspicious traffic.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of WordPress and its themes. Organizations and individuals using the affected theme are at risk of data breaches, unauthorized access, and service disruptions. This underscores the importance of timely patching and adherence to best security practices.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Deserialization of Untrusted Data leading to Object Injection.
• Affected Component: CozyStay theme for WordPress.
• Exploitation: The vulnerability can be exploited by sending a crafted payload that is deserialized by the application.
• Detection: Monitor for unusual network traffic patterns, especially those targeting the deserialization process. Use tools like Web Application Firewalls (WAFs) to detect and block such attempts.
• Patching: Apply the patch provided in version 1.7.1 of the CozyStay theme. Ensure that all instances are updated promptly.
• References:
  • Patchstack Vulnerability Database
  • NVD CVE-2025-49507

By understanding the technical details and implementing the recommended mitigation strategies, organizations can effectively protect against this critical vulnerability.