CVE-2021-39837 : Vulnerability Insights and Analysis

Adobe Acrobat Reader DC versions are affected by a use-after-free vulnerability that can lead to remote code execution.

Understanding CVE-2021-39837

This CVE involves a critical vulnerability in Adobe Acrobat Reader DC, potentially allowing an attacker to execute arbitrary code remotely.

What is CVE-2021-39837?

The vulnerability arises from the processing of the AcroForm deleteItemAt action, enabling an attacker to execute malicious code by exploiting the use-after-free flaw.

The Impact of CVE-2021-39837

The vulnerability poses a high risk, with a base score of 7.8 out of 10, affecting confidentiality, integrity, and availability of systems. User interaction is required for exploitation.

Technical Details of CVE-2021-39837

This section provides a detailed technical overview of the vulnerability.

Vulnerability Description

The use-after-free vulnerability in Acrobat Reader DC versions 2021.005.20060 and earlier allows for arbitrary code execution in the context of the current user.

Affected Systems and Versions

Adobe Acrobat Reader DC 2021.005.20060 and earlier
Adobe Acrobat Reader DC 2020.004.30006 and earlier
Adobe Acrobat Reader DC 2017.011.30199 and earlier

Exploitation Mechanism

Exploiting this vulnerability requires a victim to open a malicious file, triggering the use-after-free flaw and allowing the attacker to execute arbitrary code.

Mitigation and Prevention

Below are steps to mitigate the CVE-2021-39837 vulnerability:

Immediate Steps to Take

Update Adobe Acrobat Reader DC to the latest version
Avoid opening files from untrusted sources

Long-Term Security Practices

Regularly update software and security patches
Implement strong endpoint protection measures

Patching and Updates

Ensure timely installation of security patches provided by Adobe to address the vulnerability.