EUVD-2025-20245

Comprehensive Technical Analysis of EUVD-2025-20245

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-20245, also known as CVE-2025-6810, is a critical deserialization of untrusted data flaw in Mescius ActiveReports.NET. This vulnerability allows remote attackers to execute arbitrary code on affected systems. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a high risk. The CVSS vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability has a high impact on confidentiality.
• Integrity (I): High (H) - The vulnerability has a high impact on integrity.
• Availability (A): High (H) - The vulnerability has a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending specially crafted data to the ReadValue method of the ActiveReports.NET library. Since the method does not properly validate user-supplied data, an attacker can exploit this by deserializing untrusted data, leading to remote code execution (RCE). Potential exploitation methods include:

• Network-Based Attacks: Attackers can send malicious data over the network to applications that use the vulnerable library.
• Web-Based Attacks: If the library is used in web applications, attackers can exploit the vulnerability through HTTP requests.
• File-Based Attacks: If the library processes files, attackers can craft malicious files that, when processed, trigger the vulnerability.

3. Affected Systems and Software Versions

The vulnerability affects Mescius ActiveReports.NET version 18.1.1. Organizations using this specific version of the library are at risk. It is crucial to identify all instances of this library within the organization's software ecosystem.

4. Recommended Mitigation Strategies

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

• Patch Management: Apply the latest patches and updates provided by Mescius. Ensure that all instances of ActiveReports.NET are updated to a version that addresses this vulnerability.
• Input Validation: Implement robust input validation mechanisms to ensure that only trusted data is processed by the ReadValue method.
• Network Segmentation: Segment networks to limit the exposure of vulnerable systems to potential attackers.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities that may indicate an attempt to exploit this vulnerability.
• Access Controls: Implement strict access controls to limit the number of users and systems that can interact with the vulnerable library.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant. Organizations across various sectors, including finance, healthcare, and government, that rely on Mescius ActiveReports.NET are at risk. The potential for remote code execution can lead to data breaches, system compromises, and financial losses. Compliance with regulations such as GDPR may also be affected if sensitive data is compromised.

6. Technical Details for Security Professionals

For security professionals, the following technical details are essential:

• Vulnerability Identification: The vulnerability is identified by EUVD-2025-20245 and CVE-2025-6810.
• Affected Component: The ReadValue method in Mescius ActiveReports.NET version 18.1.1.
• Exploitation: The vulnerability is exploited by sending untrusted data to the ReadValue method, leading to deserialization and remote code execution.
• Detection: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect and block malicious data patterns associated with this vulnerability.
• Response: Develop incident response plans that include steps for identifying, containing, and remediating systems affected by this vulnerability.

Conclusion

The Mescius ActiveReports.NET ReadValue Deserialization of Untrusted Data Remote Code Execution Vulnerability (EUVD-2025-20245) poses a significant risk to organizations using the affected software. Immediate action is required to patch vulnerable systems, implement robust security controls, and enhance monitoring to mitigate the risk of exploitation. The European cybersecurity landscape must remain vigilant and proactive in addressing this critical vulnerability to protect against potential attacks.