CVE-2020-3421 Explained : Impact and Mitigation

Multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause denial of service by reloading the device or stopping traffic forwarding.

Understanding CVE-2020-3421

This CVE involves vulnerabilities in Cisco IOS XE Software's Zone-Based Firewall feature that could be exploited by attackers to disrupt device functionality.

What is CVE-2020-3421?

The vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could be abused by sending specific traffic patterns through the device, leading to a denial of service.

The Impact of CVE-2020-3421

Attackers can cause the device to reload or stop forwarding traffic through the firewall, resulting in a denial of service.

Technical Details of CVE-2020-3421

This section provides detailed technical information about the CVE.

Vulnerability Description

Incomplete handling of Layer 4 packets in Cisco IOS XE Software's Zone-Based Firewall feature.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Version: Not applicable

Exploitation Mechanism

Attackers exploit the vulnerabilities by sending specific traffic patterns through the device.

Mitigation and Prevention

Steps to address and prevent the CVE.

Immediate Steps to Take

Apply vendor patches and updates promptly.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement network segmentation and access controls.
Conduct regular security assessments and audits.

Patching and Updates

Refer to the vendor's security advisory for patching instructions and updates.