CVE-2021-23400 : What You Need to Know

A detailed overview of CVE-2021-23400, a vulnerability in the nodemailer package before version 6.6.1 that is susceptible to HTTP Header Injection.

Understanding CVE-2021-23400

This section delves into the impact, technical details, and mitigation strategies related to CVE-2021-23400.

What is CVE-2021-23400?

The nodemailer package versions prior to 6.6.1 are vulnerable to HTTP Header Injection, enabling an attack if unsanitized user input with newlines and carriage returns is injected into an address object.

The Impact of CVE-2021-23400

The vulnerability carries a CVSS base score of 6.3 (Medium severity) with low impacts on confidentiality, integrity, and availability. It has a low attack complexity and requires user interaction.

Technical Details of CVE-2021-23400

This section discusses the vulnerability description, affected systems, and how the exploit works.

Vulnerability Description

The flaw in nodemailer allows HTTP Header Injection through unfiltered user input, potentially leading to malicious activities.

Affected Systems and Versions

The issue impacts nodemailer versions before 6.6.1 and custom versions that fall below this threshold.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting crafted input containing newlines and carriage returns into an address object.

Mitigation and Prevention

Learn how to safeguard your systems against CVE-2021-23400 and reduce the associated risks.

Immediate Steps to Take

Ensure all user inputs are sanitized to prevent malicious injections. Consider updating to nodemailer version 6.6.1 or above.

Long-Term Security Practices

Implement strict input validation measures and conduct regular security audits to detect and mitigate similar vulnerabilities.

Patching and Updates

Stay informed about security patches released by nodemailer and promptly apply updates to address known vulnerabilities.