EUVD-2025-4863

Comprehensive Technical Analysis of EUVD-2025-4863

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-4863, also known as CVE-2021-46686, pertains to an OS Command Injection issue in acmailer CGI ver.4.0.3 and earlier, as well as acmailer DB ver.1.1.5 and earlier. This vulnerability allows an attacker to execute arbitrary OS commands, which can lead to significant security breaches.

Severity Evaluation:

• CVSS Base Score: 9.8 (Critical)
• CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability. The vector breakdown shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), does not need privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability remotely by sending crafted input to the vulnerable CGI or DB components.
• Web Application Attacks: Since the vulnerability affects web-based components, attackers can leverage web application attacks such as cross-site scripting (XSS) or SQL injection to deliver the payload.

Exploitation Methods:

• Command Injection: The primary exploitation method involves injecting malicious OS commands into input fields that are not properly sanitized.
• Automated Scripts: Attackers may use automated scripts to scan for vulnerable versions of acmailer and execute the injection attacks.

3. Affected Systems and Software Versions

Affected Software:

• acmailer CGI: ver.4.0.3 and earlier
• acmailer DB: ver.1.1.5 and earlier

Vendor:

• Extra Innovation Inc.

Product IDs:

• acmailer CGI: 5b585931-5b26-36a0-9cf4-62e65b360fd0
• acmailer DB: 8cf734bd-6c9f-365d-a290-b99514cbca05

4. Recommended Mitigation Strategies

Immediate Actions:

• Patching: Upgrade to the latest versions of acmailer CGI and acmailer DB that address this vulnerability.
• Input Validation: Implement robust input validation and sanitization mechanisms to prevent command injection.
• Access Controls: Restrict access to the vulnerable components to trusted users and networks.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Security Training: Provide training for developers and administrators on secure coding practices and input validation techniques.
• Monitoring: Implement continuous monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The critical nature of this vulnerability poses a significant risk to organizations using acmailer software within the European Union. The potential for remote exploitation and the high impact on confidentiality, integrity, and availability make it a prime target for cybercriminals. Organizations must prioritize patching and implementing robust security measures to mitigate the risk.

6. Technical Details for Security Professionals

Vulnerability Details:

• Type: OS Command Injection
• Cause: Improper neutralization of special elements used in an OS command.
• Exploitability: High, due to low complexity and no requirement for privileges or user interaction.

Detection and Response:

• Detection: Use intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor for suspicious command execution patterns.
• Response: Implement incident response plans to quickly identify and mitigate any successful exploitation attempts.

References:

• NVD CVE-2021-46686
• acmailer Security Information
• JVN Vulnerability Details

Conclusion: EUVD-2025-4863 represents a critical vulnerability that requires immediate attention from organizations using the affected versions of acmailer. By implementing the recommended mitigation strategies and maintaining vigilant security practices, organizations can significantly reduce the risk of exploitation and protect their systems from potential attacks.