CVE-2021-40725 : What You Need to Know

Adobe Acrobat Reader DC AcroForm listbox Use-After-Free Remote Code Execution Vulnerability

Understanding CVE-2021-40725

CVE-2021-40725 is a vulnerability affecting Adobe Acrobat Reader DC versions 2021.005.20060 and earlier, 2020.004.30006 and earlier, and 2017.011.30199 and earlier. The vulnerability allows for a use-after-free scenario when processing AcroForm listbox, potentially leading to arbitrary code execution.

What is CVE-2021-40725?

The CVE-2021-40725 vulnerability in Acrobat Reader DC versions could be exploited by a user visiting a malicious website or opening a malicious file. It results in the execution of arbitrary code within the current user context.

The Impact of CVE-2021-40725

The impact severity of CVE-2021-40725 is rated as high with a base score of 7.8. The confidentiality, integrity, and availability of the affected systems are all at risk due to this vulnerability.

Technical Details of CVE-2021-40725

CVE-2021-40725 involves a use-after-free vulnerability with the following technical details:

Vulnerability Description

The vulnerability arises when processing AcroForm listbox in Adobe Acrobat Reader DC versions, enabling attackers to execute arbitrary code.

Affected Systems and Versions

Adobe Acrobat Reader DC versions 2021.005.20060 (and earlier)
Adobe Acrobat Reader DC versions 2020.004.30006 (and earlier)
Adobe Acrobat Reader DC versions 2017.011.30199 (and earlier)

Exploitation Mechanism

User interaction is required to exploit this vulnerability, typically by visiting a malicious webpage or opening a malicious file that triggers the use-after-free scenario.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-40725, users and organizations can take the following steps:

Immediate Steps to Take

Update Adobe Acrobat Reader DC to the latest version.
Avoid visiting untrusted websites or opening unknown files.
Implement security awareness training to recognize phishing attempts.

Long-Term Security Practices

Regularly update software and implement security patches.
Use reliable antivirus software and firewalls to enhance system security.

Patching and Updates

Adobe has released security updates to address CVE-2021-40725. Ensure that your Acrobat Reader DC installation is updated with the latest patches and security improvements.