CVE-2021-21063 : Security Advisory and Response

A Memory corruption vulnerability in Adobe Acrobat Reader DC versions could allow an attacker to execute arbitrary code in the context of the current user.

Understanding CVE-2021-21063

This CVE identifies a Buffer Overflow Vulnerability in Adobe Acrobat Reader DC that could lead to arbitrary code execution.

What is CVE-2021-21063?

Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier are affected. An attacker could exploit this by tricking a victim into opening a malicious PDF file.

The Impact of CVE-2021-21063

The vulnerability has a CVSS base score of 7.8, indicating a high severity level. It requires low attack complexity and no privileges to execute arbitrary code.

Technical Details of CVE-2021-21063

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability stems from a memory corruption issue when parsing crafted PDF files, enabling attackers to achieve code execution.

Affected Systems and Versions

Adobe Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier are impacted.

Exploitation Mechanism

Exploitation involves user interaction, where the victim needs to open a malicious PDF file to trigger the vulnerability.

Mitigation and Prevention

To safeguard systems from CVE-2021-21063, consider the following measures.

Immediate Steps to Take

Ensure users exercise caution when opening PDF files, especially from unknown sources. Additionally, consider temporarily disabling Acrobat Reader until a patch is available.

Long-Term Security Practices

Regularly updating Adobe Acrobat Reader to the latest version can help mitigate known vulnerabilities and enhance security.

Patching and Updates

Stay informed about security updates from Adobe and promptly apply patches to address known vulnerabilities.