CVE-2021-21039 : Exploit Details and Defense Strategies

A critical vulnerability, CVE-2021-21039, has been discovered in Adobe Acrobat Reader DC. This Use After Free vulnerability could be exploited by an unauthenticated attacker to execute arbitrary code on the victim's system.

Understanding CVE-2021-21039

This section will cover the impact, technical details, and mitigation strategies related to CVE-2021-21039.

What is CVE-2021-21039?

Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, as well as 2017.011.30188 and earlier are affected by a Use After Free vulnerability. Attackers can exploit this flaw to achieve arbitrary code execution in the context of the current user.

The Impact of CVE-2021-21039

The vulnerability has a CVSS base score of 7.8, indicating a high severity issue. It has a significant impact on confidentiality, integrity, and availability.

Technical Details of CVE-2021-21039

Let's delve into the specifics of this vulnerability.

Vulnerability Description

The Use After Free vulnerability in Adobe Acrobat Reader DC allows attackers to execute arbitrary code by tricking users into opening a malicious file.

Affected Systems and Versions

Acrobat Reader DC versions, including 2020.013.20074, 2020.001.30018, and 2017.011.30188, are confirmed to be vulnerable.

Exploitation Mechanism

Exploitation of this vulnerability requires user interaction, where the victim unknowingly opens a specially crafted file.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-21039.

Immediate Steps to Take

Users are advised to update their Acrobat Reader DC to the latest patched version immediately to mitigate the risk of exploitation.

Long-Term Security Practices

Implement secure document handling policies and educate users about the risks associated with opening unknown files.

Patching and Updates

Regularly check for security updates from Adobe and apply them promptly to ensure your system is protected against known vulnerabilities.