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CVE-2021-21017 : Vulnerability Insights and Analysis

Critical heap-based buffer overflow vulnerability in Adobe Acrobat Reader DC versions allows arbitrary code execution. Learn how to mitigate the risks and apply necessary patches.

A heap-based buffer overflow vulnerability in Adobe Acrobat Reader DC versions could allow an attacker to execute arbitrary code.

Understanding CVE-2021-21017

This CVE describes a critical vulnerability in Adobe Acrobat Reader DC that could lead to arbitrary code execution.

What is CVE-2021-21017?

Adobe Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier are affected by a heap-based buffer overflow vulnerability. Exploitation of this issue could result in an attacker executing arbitrary code within the context of the current user.

The Impact of CVE-2021-21017

The impact of this vulnerability is rated as high, with a CVSS base score of 8.8. An unauthenticated attacker could exploit this issue, requiring user interaction by convincing a victim to open a malicious file.

Technical Details of CVE-2021-21017

This section provides more technical details about the vulnerability.

Vulnerability Description

The vulnerability is categorized as a heap-based buffer overflow (CWE-122), allowing an unauthenticated attacker to trigger arbitrary code execution.

Affected Systems and Versions

Adobe Acrobat Reader DC versions 2020.013.20074, 2020.001.30018, and 2017.011.30188 are confirmed to be affected by this vulnerability.

Exploitation Mechanism

Successful exploitation of this vulnerability requires an attacker to craft a malicious file and convince the victim to open it, triggering the heap-based buffer overflow.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21017, users and organizations are advised to take immediate action and follow best security practices.

Immediate Steps to Take

Immediately update Adobe Acrobat Reader DC to the latest version to address the heap-based buffer overflow vulnerability.

Long-Term Security Practices

Implementing strict file validation checks and user awareness training can help prevent successful exploitation of similar vulnerabilities in the future.

Patching and Updates

Regularly check for security updates from Adobe and apply patches promptly to protect systems from known vulnerabilities.

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