CVE-2020-3510 : What You Need to Know

A vulnerability in the Umbrella Connector component of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches could allow an unauthenticated, remote attacker to trigger a reload, resulting in a denial of service condition on an affected device.

Understanding CVE-2020-3510

This CVE involves a vulnerability in Cisco IOS XE Software that could lead to a denial of service attack on Cisco Catalyst 9200 Series Switches.

What is CVE-2020-3510?

The vulnerability arises from insufficient error handling when parsing DNS requests, allowing an attacker to send malicious DNS requests to an Umbrella Connector client interface, leading to a crash of the iosd process and subsequent device reload.

The Impact of CVE-2020-3510

The vulnerability has a CVSS base score of 8.6, indicating a high severity level. It can result in a denial of service condition on affected devices, potentially disrupting network operations.

Technical Details of CVE-2020-3510

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in the Umbrella Connector component of Cisco IOS XE Software allows remote attackers to trigger a reload on affected devices by exploiting insufficient error handling in DNS request parsing.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Versions: Not applicable (n/a)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Availability Impact: High
Privileges Required: None
Scope: Changed
User Interaction: None
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and Prevention

Protecting systems from CVE-2020-3510 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious DNS requests.

Long-Term Security Practices

Regularly update and patch all software and firmware on network devices.
Conduct security training for employees to raise awareness of potential threats.
Utilize intrusion detection and prevention systems to enhance network security.

Patching and Updates

Cisco has likely released patches or updates to address the vulnerability. Ensure timely installation of these patches to mitigate the risk of exploitation.