CVE-2021-22956 Explained : Impact and Mitigation

A vulnerability in Citrix ADC versions below 13.0-83.27, 12.1-63.22, and 11.1-65.23 could allow an attacker to disrupt Management GUI, Nitro API, and RPC communication.

Understanding CVE-2021-22956

This CVE identifies an uncontrolled resource consumption vulnerability in Citrix ADC products.

What is CVE-2021-22956?

An uncontrolled resource consumption flaw in Citrix ADC below specific versions may lead to a temporary disruption in various communication interfaces.

The Impact of CVE-2021-22956

Attackers can exploit this vulnerability with access to certain interfaces to cause a temporary denial of service in affected systems.

Technical Details of CVE-2021-22956

This section provides essential technical information about the vulnerability.

Vulnerability Description

The vulnerability allows attackers with access to specific interfaces to disrupt Management GUI, Nitro API, and RPC communication temporarily.

Affected Systems and Versions

Citrix ADC versions 11.1, 12.1, 13.0, and 13.1 are affected.

Exploitation Mechanism

Attackers with access to NSIP or SNIP with management interface access can exploit this vulnerability.

Mitigation and Prevention

Protect your systems from CVE-2021-22956 by following the recommendations below.

Immediate Steps to Take

Ensure restricted access to NSIP or SNIP interfaces and monitor for any unusual resource consumption.

Long-Term Security Practices

Regularly update Citrix ADC products to the latest versions and implement security best practices.

Patching and Updates

Apply security patches provided by Citrix to mitigate the vulnerability effectively.