CVE-2017-3875 : What You Need to Know

A vulnerability has been discovered in certain access-control filtering mechanisms on Cisco Nexus 7000 Series Switches, potentially allowing remote unauthenticated attackers to bypass traffic configurations within an access control list (ACL).

Understanding CVE-2017-3875

What is CVE-2017-3875?

This CVE identifies an Access-Control Filtering Mechanisms Bypass Vulnerability in Cisco Nexus 7000 Series Switches.

The Impact of CVE-2017-3875

The vulnerability could enable remote, unauthenticated attackers to bypass defined traffic configurations within an ACL on affected systems.

Technical Details of CVE-2017-3875

Vulnerability Description

The vulnerability exists in access-control filtering mechanisms on Cisco Nexus 7000 Series Switches.

Affected Systems and Versions

Affected versions include 5.2(4), 6.1(3)S5, 6.1(3)S6, 6.2(1.121)S0, 7.2(1)D1(1), 7.3(0)ZN(0.161), and 7.3(1)N1(0.1).

Exploitation Mechanism

Attackers can exploit this vulnerability remotely without authentication, bypassing ACL traffic configurations.

Mitigation and Prevention

Immediate Steps to Take

Apply patches for fixed releases to mitigate the vulnerability.
Monitor Cisco's security advisories for updates and recommendations.

Long-Term Security Practices

Regularly update and patch Cisco Nexus 7000 Series Switches.
Implement network segmentation and access controls to limit exposure.

Patching and Updates

Ensure all affected systems are updated with the fixed releases provided by Cisco.