CVE-2021-40900 : What You Need to Know

This CVE article provides detailed information about a Regular Expression Denial of Service (ReDOS) vulnerability in regexfn v1.0.5.

Understanding CVE-2021-40900

This section explains the vulnerability and its impact.

What is CVE-2021-40900?

A Regular Expression Denial of Service (ReDOS) vulnerability was found in regexfn v1.0.5 when validating crafted invalid emails.

The Impact of CVE-2021-40900

The vulnerability could potentially lead to a denial of service condition by exploiting crafted invalid emails.

Technical Details of CVE-2021-40900

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability exists in regexfn v1.0.5 during the validation of crafted invalid emails, allowing for ReDOS attacks.

Affected Systems and Versions

Affected Product: n/a
Affected Version: n/a

Exploitation Mechanism

The vulnerability can be exploited by sending specifically crafted invalid email inputs, leading to a ReDOS attack.

Mitigation and Prevention

Explore the steps to mitigate and prevent the vulnerability.

Immediate Steps to Take

Regularly update the application to apply security patches.
Implement input validation to detect and prevent crafted invalid emails.

Long-Term Security Practices

Conduct regular security audits to identify and address vulnerabilities.
Educate developers on secure coding practices to prevent ReDOS vulnerabilities.

Patching and Updates

Ensure the application is updated to the latest version of regexfn to mitigate the ReDOS vulnerability.