CVE-2021-22821 Explained : Impact and Mitigation
Discover the impact of CVE-2021-22821, a Server-Side Request Forgery (SSRF) flaw in Schneider's charging station web servers. Learn about affected systems, exploitation risks, and mitigation steps.
A CWE-918 Server-Side Request Forgery (SSRF) vulnerability exists in the charging station web server, allowing crafted malicious parameters to redirect requests to unintended network targets.
Understanding CVE-2021-22821
This CVE identifies a security flaw that could lead to SSRF attacks impacting the charging station web servers.
What is CVE-2021-22821?
The vulnerability in the server allows attackers to manipulate requests to access unintended network resources, posing a risk to the charging station web server.
The Impact of CVE-2021-22821
If exploited, this vulnerability could result in unauthorized access to sensitive information, network compromise, and potential misuse of the affected products.
Technical Details of CVE-2021-22821
The following technical aspects of the CVE provide a deeper insight into the issue:
Vulnerability Description
The vulnerability enables SSRF attacks by redirecting requests through malicious parameters, potentially compromising network integrity.
Affected Systems and Versions
EVlink City EVC1S22P4 / EVC1S7P4, EVlink Parking EVW2 / EVF2 / EVP2PE, and EVlink Smart Wallbox EVB1A are affected prior to R8 V3.4.0.2.
Exploitation Mechanism
Crafted parameters submitted to the charging station web server trigger the vulnerability, leading to unauthorized requests and network exposure.
Mitigation and Prevention
To safeguard systems from CVE-2021-22821, immediate actions and long-term security measures are crucial.
Immediate Steps to Take
- Update affected products to the latest version R8 V3.4.0.2 to mitigate the SSRF vulnerability.
- Monitor network traffic and server requests for any unusual behavior.
Long-Term Security Practices
- Regularly apply software patches and security updates to all connected devices.
- Implement network segmentation and access controls to restrict unauthorized access.
Patching and Updates
Stay informed about security advisories and patches released by the vendor to address vulnerabilities and enhance system security.