CVE-2021-39842 : Vulnerability Insights and Analysis

Adobe Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier), and 2017.011.30199 (and earlier) are affected by a use-after-free vulnerability that could lead to arbitrary code execution. This article provides details on the impact, technical description, and mitigation steps.

Understanding CVE-2021-39842

This section delves into the details of the vulnerability.

What is CVE-2021-39842?

Acrobat Reader DC versions are susceptible to a use-after-free vulnerability that poses a risk of arbitrary code execution. Exploiting this issue requires a user to interact by opening a malicious file.

The Impact of CVE-2021-39842

The vulnerability has the following impact:

CVSS Base Score: 7.8 (High)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Confidentiality, Integrity, and Availability Impact: High

Technical Details of CVE-2021-39842

Explore the specifics of the vulnerability.

Vulnerability Description

A use-after-free vulnerability in Adobe Acrobat Reader DC versions enables arbitrary code execution.

Affected Systems and Versions

The vulnerability impacts:

Product: Acrobat Reader
Vendor: Adobe
Affected Versions:
DC 2021 July and earlier
20.0-Classic 2021 July and earlier
17.0-Classic 2021 July and earlier

Exploitation Mechanism

To exploit, a user must engage by opening a malicious file.

Mitigation and Prevention

Learn how to secure your systems against CVE-2021-39842.

Immediate Steps to Take

Take the following measures:

Update Acrobat Reader to the latest version.
Avoid opening files from untrusted sources.
Apply security best practices.

Long-Term Security Practices

Implement these practices:

Regularly update software.
Educate users on safe browsing habits.
Employ security solutions like antivirus software.

Patching and Updates

Stay protected by promptly installing security patches and updates issued by Adobe.