CVE-2020-3418 : Security Advisory and Response

A vulnerability in Cisco IOS XE Wireless Controller Software for Cisco Catalyst 9800 Series Routers could allow an unauthenticated, adjacent attacker to send ICMPv6 traffic prior to the client being placed into RUN state.

Understanding CVE-2020-3418

This CVE involves an improper access control vulnerability in Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family.

What is CVE-2020-3418?

The vulnerability allows an attacker to send ICMPv6 traffic before the client enters the RUN state due to an incomplete access control list (ACL) being applied.

The Impact of CVE-2020-3418

If exploited, an attacker could send ICMPv6 traffic before the client enters the RUN state, potentially leading to unauthorized network access.

Technical Details of CVE-2020-3418

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from incomplete ACL application before the client enters the RUN state, enabling unauthorized ICMPv6 traffic.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Version: n/a

Exploitation Mechanism

An attacker connects to the SSID and sends ICMPv6 traffic to exploit the vulnerability.

Mitigation and Prevention

Protect your systems from CVE-2020-3418 with the following steps:

Immediate Steps to Take

Apply the latest security patches from Cisco.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Implement strong network segmentation to limit unauthorized access.
Regularly update and patch all network devices.

Patching and Updates

Stay informed about security advisories from Cisco.
Regularly check for and apply software updates and patches.