CVE-2021-22393 : Security Advisory and Response

A denial of service vulnerability has been identified in several versions of CloudEngine switches, including CloudEngine 5800, 6800, 7800, and 12800. This vulnerability allows attackers to exploit a weakness in the module design, leading to a denial of service condition that can disrupt regular operations.

Understanding CVE-2021-22393

This CVE describes a remote code execution vulnerability affecting CloudEngine switches, potentially enabling malicious actors to disrupt services by sending specific messages.

What is CVE-2021-22393?

The CVE-2021-22393 refers to a denial of service vulnerability affecting specific versions of Huawei's CloudEngine switches. Attackers can leverage this weakness to overwhelm the affected devices with a large volume of messages, leading to a disruption of services.

The Impact of CVE-2021-22393

The impact of this vulnerability is severe as it can result in a denial of service, compromising the normal functioning of the CloudEngine switches. This disruption could lead to downtime and affect critical services running on the network.

Technical Details of CVE-2021-22393

This section will provide detailed insights into the vulnerability itself, the affected systems, and how exploitation can occur.

Vulnerability Description

The vulnerability lies in the module design of CloudEngine switches, making them unable to handle specific messages effectively. This weakness can be exploited by sending a high volume of messages to trigger a denial of service condition.

Affected Systems and Versions

CloudEngine switches including 5800, 6800, 7800, and 12800 are impacted by CVE-2021-22393. The specific affected versions include V200R002C50SPC800, V200R003C00SPC810, V200R005C00SPC800, and V200R005C10SPC800.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by sending a significant number of specific messages to the CloudEngine switches. This flood of messages overwhelms the devices' capacity, leading to a denial of service situation.

Mitigation and Prevention

To safeguard against CVE-2021-22393 and prevent any potential exploitation, it is crucial to take immediate action and adopt long-term security measures.

Immediate Steps to Take

Immediate steps involve applying patches or updates provided by the vendor, restricting network access, and monitoring for any suspicious activity that may indicate an ongoing attack.

Long-Term Security Practices

Long-term security practices include regularly updating security patches, conducting security audits, implementing network segmentation, and ensuring employees are educated on cybersecurity best practices.

Patching and Updates

Huawei has released security advisories addressing CVE-2021-22393. Organizations using the affected CloudEngine switches should promptly apply the recommended patches and updates to mitigate the risk of exploitation.