CVE-2021-22721 Explained : Impact and Mitigation

A CWE-200 vulnerability has been identified in Schneider Electric's EVlink City, EVlink Parking, and EVlink Smart Wallbox products. This vulnerability could allow attackers to gain insight into JavaScript code through malicious parameters.

Understanding CVE-2021-22721

This CVE pertains to an Information Exposure vulnerability in certain versions of Schneider Electric's charging station products, potentially exposing sensitive information to attackers.

What is CVE-2021-22721?

CVE-2021-22721 is a security vulnerability found in EVlink City, EVlink Parking, and EVlink Smart Wallbox products manufactured by Schneider Electric. The flaw enables threat actors to obtain partial knowledge of JavaScript code by manipulating specific parameters.

The Impact of CVE-2021-22721

The impact of this vulnerability lies in the potential disclosure of JavaScript code, which could assist malicious entities in further exploiting the charging station's web server.

Technical Details of CVE-2021-22721

This section delves into the specifics of the vulnerability affecting Schneider Electric's EVlink products.

Vulnerability Description

The CWE-200 vulnerability in EVlink City, EVlink Parking, and EVlink Smart Wallbox facilitates unauthorized access to JavaScript code through the input of malicious parameters.

Affected Systems and Versions

All versions of EVlink City (EVC1S22P4 / EVC1S7P4), EVlink Parking (EVW2 / EVF2 / EV.2), and EVlink Smart Wallbox (EVB1A) prior to R8 V3.4.0.1 are impacted by CVE-2021-22721.

Exploitation Mechanism

Attackers can exploit this vulnerability by submitting tailored malicious parameters to the charging station's web server, allowing them to extract limited JavaScript insights.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-22721, prompt actions must be taken to secure the affected Schneider Electric products.

Immediate Steps to Take

It is advised to update the EVlink City, EVlink Parking, and EVlink Smart Wallbox products to version R8 V3.4.0.1 or newer to address the CWE-200 vulnerability.

Long-Term Security Practices

Employing robust security measures, such as network segmentation and access controls, can enhance the overall security posture and reduce the likelihood of exploitation.

Patching and Updates

Regularly monitoring and applying firmware updates provided by Schneider Electric is crucial to safeguard against known vulnerabilities and enhance the resilience of the EVlink charging station products.