EUVD-2025-19291

Comprehensive Technical Analysis of EUVD-2025-19291

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19291 pertains to a Deserialization of Untrusted Data issue in the Everest Forms plugin for WordPress, which allows for Object Injection. This vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical severity level. The CVSS 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 does not require specialized conditions.
• Privileges Required (PR:N): None, meaning no privileges are required to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect resources beyond the security scope managed by the security authority.
• Confidentiality (C:H): High, indicating a complete loss of confidentiality.
• Integrity (I:H): High, indicating a complete loss of integrity.
• Availability (A:H): High, indicating a complete loss of availability.

Given these metrics, the vulnerability poses a significant risk to systems using the affected versions of Everest Forms.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector for this vulnerability is the deserialization of untrusted data, which can lead to Object Injection. An attacker could exploit this by:

• Crafting Malicious Input: Sending specially crafted serialized data to the application.
• Object Injection: Exploiting the deserialization process to inject malicious objects that can execute arbitrary code or manipulate the application's behavior.
• Remote Code Execution (RCE): If the injected objects can execute system commands, the attacker could gain full control over the affected system.

3. Affected Systems and Software Versions

The vulnerability affects Everest Forms versions from n/a through 3.2.2. This means any WordPress site using Everest Forms within this version range is at risk. It is crucial for administrators to identify and update these plugins immediately.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps are recommended:

• Immediate Patching: Upgrade to a patched version of Everest Forms as soon as it becomes available.
• Input Validation: Implement strict input validation and sanitization to ensure that only trusted data is deserialized.
• Disable Unnecessary Features: Disable any features or functionalities that are not in use, especially those related to deserialization.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities related to deserialization processes.
• Network Segmentation: Implement network segmentation to limit the spread of potential attacks.

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 plugins, including Everest Forms. Organizations and individuals relying on these tools for their web presence are at risk of data breaches, unauthorized access, and potential 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:

• Deserialization Process: Understand the deserialization process in Everest Forms and identify points where untrusted data is handled.
• Code Review: Conduct a thorough code review to identify and mitigate similar vulnerabilities in other parts of the application.
• Security Tools: Utilize security tools such as static analysis, dynamic analysis, and vulnerability scanners to detect and prevent similar issues.
• Incident Response: Prepare an incident response plan that includes steps for identifying, containing, and remediating deserialization-related vulnerabilities.
• Training and Awareness: Ensure that developers and administrators are trained in secure coding practices and are aware of the risks associated with deserialization of untrusted data.

Conclusion

The Deserialization of Untrusted Data vulnerability in Everest Forms (EUVD-2025-19291) is a critical issue that requires immediate attention. By understanding the attack vectors, affected systems, and mitigation strategies, cybersecurity professionals can effectively protect their organizations from potential exploits. Continuous monitoring, timely patching, and adherence to best security practices are essential in maintaining a robust cybersecurity posture.