CVE-2020-6111 Explained : Impact and Mitigation

An exploitable denial-of-service vulnerability exists in the IPv4 functionality of Allen-Bradley MicroLogix 1100 Programmable Logic Controller Systems Series B FRN 16.000, Series B FRN 15.002, Series B FRN 15.000, Series B FRN 14.000, Series B FRN 13.000, Series B FRN 12.000, Series B FRN 11.000, and Series B FRN 10.000. A specially crafted packet can cause a major error, resulting in a denial of service. An attacker can send a malicious packet to trigger this vulnerability.

Understanding CVE-2020-6111

This CVE involves a denial-of-service vulnerability in Allen-Bradley MicroLogix 1100 PLC Systems.

What is CVE-2020-6111?

The CVE-2020-6111 vulnerability is a denial-of-service issue in the IPv4 functionality of Allen-Bradley MicroLogix 1100 PLC Systems.

The Impact of CVE-2020-6111

The vulnerability has a CVSS base score of 7.5, indicating a high severity level. The impact includes:

Attack Vector: Network
Attack Complexity: Low
Availability Impact: High
Confidentiality Impact: None
Integrity Impact: None
Privileges Required: None
User Interaction: None
Scope: Unchanged

Technical Details of CVE-2020-6111

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability allows an attacker to exploit the IPv4 functionality of the affected PLC systems, leading to a denial of service.

Affected Systems and Versions

Allen-Bradley MicroLogix 1100 PLC Systems Series B FRN 10.000 to FRN 16.000

Exploitation Mechanism

An attacker can send a specially crafted packet to trigger a major error, causing a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2020-6111 is crucial for maintaining security.

Immediate Steps to Take

Apply vendor-supplied patches promptly
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch all PLC systems
Conduct security assessments and penetration testing
Educate employees on cybersecurity best practices

Patching and Updates

Stay informed about security updates from the vendor
Regularly check for firmware updates and apply them as soon as possible