CVE-2021-39863 : Security Advisory and Response

Adobe Acrobat Reader DC versions 2021.005.20060 and earlier are affected by a Buffer Overflow vulnerability. An attacker could exploit this to execute arbitrary code. User interaction is required.

Understanding CVE-2021-39863

This CVE details a Heap-based Buffer Overflow vulnerability in Adobe Acrobat Reader DC that could allow arbitrary code execution.

What is CVE-2021-39863?

Acrobat Reader DC versions 2021.005.20060 and earlier are affected
Vulnerability allows attackers to execute arbitrary code
Requires user interaction to exploit by opening a malicious file

The Impact of CVE-2021-39863

Attack Complexity: Low
Attack Vector: Local
Availability Impact: High
Confidentiality, Integrity Impact: High
No privileges required
User interaction required

Technical Details of CVE-2021-39863

This section provides more technical details about the vulnerability.

Vulnerability Description

Type: Heap-based Buffer Overflow (CWE-122)
Exploitable through parsing specially crafted PDF files

Affected Systems and Versions

Adobe Acrobat Reader DC versions 2021.005.20060 and earlier
Versions DC 2021 July, 20.0-Classic 2021 July, 17.0-Classic 2021 July affected

Exploitation Mechanism

Requires a victim to open a malicious file

Mitigation and Prevention

Following are the steps to mitigate and prevent exploitation.

Immediate Steps to Take

Update Acrobat Reader to the latest version
Be cautious when opening PDF files from untrusted sources

Long-Term Security Practices

Regularly update software and security patches
Implement user training on recognizing phishing attempts

Patching and Updates

Apply security patches promptly to mitigate the vulnerability