CVE-2021-41987 : Vulnerability Insights and Analysis

A heap-based buffer overflow vulnerability in the SCEP Server of RouterOS in certain Mikrotik products allows remote code execution.

Understanding CVE-2021-41987

In this CVE, an attacker can exploit a vulnerability in RouterOS to execute remote code by triggering a heap-based buffer overflow.

What is CVE-2021-41987?

The vulnerability in the SCEP Server of RouterOS in specific Mikrotik products enables an attacker to conduct a heap-based buffer overflow, leading to remote code execution. The attacker needs knowledge of the scep_server_name value to exploit this vulnerability. Affected versions include RouterOS 6.46.8, 6.47.9, and 6.47.10.

The Impact of CVE-2021-41987

The exploitation of this vulnerability can result in remote code execution, giving malicious actors control over affected systems.

Technical Details of CVE-2021-41987

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows attackers to trigger a heap-based buffer overflow in the SCEP Server of RouterOS, facilitating remote code execution upon successful exploitation.

Affected Systems and Versions

RouterOS versions 6.46.8, 6.47.9, and 6.47.10 are impacted by this vulnerability in certain Mikrotik products.

Exploitation Mechanism

To exploit this vulnerability, the attacker must possess knowledge of the scep_server_name value, enabling them to trigger the heap-based buffer overflow and achieve remote code execution.

Mitigation and Prevention

Here are the steps to mitigate and prevent exploitation of CVE-2021-41987:

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Monitor network traffic for signs of exploitation.
Restrict access to vulnerable services.

Long-Term Security Practices

Regularly update RouterOS and other software components.
Implement network segmentation to limit the attack surface.
Conduct security assessments and penetration testing periodically.

Patching and Updates

Ensure timely installation of security patches released by Mikrotik to address this vulnerability.