CVE-2020-3363 : Security Advisory and Response

A vulnerability in the IPv6 packet processing engine of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

Understanding CVE-2020-3363

This CVE involves a denial of service vulnerability in Cisco Small Business Smart and Managed Switches due to insufficient validation of incoming IPv6 traffic.

What is CVE-2020-3363?

The vulnerability allows an attacker to send a crafted IPv6 packet through the device, leading to an unexpected reboot and a DoS condition.

The Impact of CVE-2020-3363

CVSS Base Score: 8.6 (High Severity)
Attack Vector: Network
Availability Impact: High
The vulnerability affects Cisco Small Business 250 Series Smart Switches Software.

Technical Details of CVE-2020-3363

The following technical details provide insight into the vulnerability and its implications.

Vulnerability Description

Insufficient validation of incoming IPv6 traffic
Specific to IPv6 traffic, not affecting IPv4

Affected Systems and Versions

Affected Product: Cisco Small Business 250 Series Smart Switches Software
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

Attacker sends a crafted IPv6 packet through the affected device
Successful exploit leads to an unexpected reboot and DoS condition

Mitigation and Prevention

Steps to address and prevent the CVE-2020-3363 vulnerability.

Immediate Steps to Take

Apply vendor-provided patches or updates
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch network devices
Conduct security assessments and audits periodically

Patching and Updates

Check for and apply patches released by Cisco
Stay informed about security advisories and updates