CVE-2021-40901 Explained : Impact and Mitigation

This CVE-2021-40901 article provides insights into a Regular Expression Denial of Service (ReDOS) vulnerability found in scniro-validator v1.0.1.

Understanding CVE-2021-40901

This section dives into the details of the CVE-2021-40901 vulnerability.

What is CVE-2021-40901?

A Regular Expression Denial of Service (ReDOS) vulnerability was identified in scniro-validator v1.0.1 when processing maliciously crafted invalid email inputs.

The Impact of CVE-2021-40901

The presence of this vulnerability could allow an attacker to execute a denial-of-service attack by sending specifically crafted invalid emails.

Technical Details of CVE-2021-40901

In this section, we explore the technical specifics of CVE-2021-40901.

Vulnerability Description

The vulnerability arises from improper input validation in scniro-validator v1.0.1 when handling certain email formats.

Affected Systems and Versions

Affected systems include instances running scniro-validator v1.0.1.

Exploitation Mechanism

Attackers can exploit this vulnerability by submitting specially constructed invalid email addresses, triggering excessive computation.

Mitigation and Prevention

Learn how to mitigate and prevent CVE-2021-40901 in this section.

Immediate Steps to Take

Update scniro-validator to a patched version if available.
Implement input validation mechanisms to detect and block crafted invalid inputs.

Long-Term Security Practices

Regularly audit and update all software dependencies for security patches.
Train developers on secure coding practices and input validation techniques.

Patching and Updates

Apply patches provided by the scniro-validator project to address and mitigate the ReDOS vulnerability.