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CVE-2021-21252 : Vulnerability Insights and Analysis

Learn about CVE-2021-21252 affecting jquery-validation plugin versions prior to 1.19.3. Find out the impact, technical details, and mitigation steps to prevent exploitation.

A detailed overview of the vulnerability in jquery-validation plugin affecting versions prior to 1.19.3.

Understanding CVE-2021-21252

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-21252.

What is CVE-2021-21252?

The jQuery Validation Plugin, specifically versions before 1.19.3, is susceptible to Regular Expression Denial of Service (ReDoS) attacks due to certain vulnerable regular expressions.

The Impact of CVE-2021-21252

The vulnerability can be exploited by an attacker to cause denial of service (DoS) by sending specially crafted input to the affected plugin, leading to resource exhaustion and system unavailability.

Technical Details of CVE-2021-21252

This section delves deeper into the description of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

jquery-validation plugin versions prior to 1.19.3 contain regular expressions that are vulnerable to ReDoS attacks, allowing malicious actors to exploit the plugin's patterns for resource consumption.

Affected Systems and Versions

The vulnerability affects jquery-validation plugin versions earlier than 1.19.3 across all systems where the plugin is integrated.

Exploitation Mechanism

Attackers can exploit the vulnerable regular expressions in the plugin by sending specially crafted input that triggers excessive backtracking, leading to a DoS condition.

Mitigation and Prevention

This section outlines immediate steps to mitigate the risk posed by CVE-2021-21252.

Immediate Steps to Take

Users are advised to update the jquery-validation plugin to version 1.19.3 or later to patch the vulnerability and prevent exploitation.

Long-Term Security Practices

Regularly monitor for security advisories and updates related to jquery-validation plugin to stay informed about future vulnerabilities and apply patches promptly.

Patching and Updates

Developers should subscribe to relevant security mailing lists and follow best practices to ensure timely application of patches and updates to mitigate security risks.

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