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CVE-2021-21041 Explained : Impact and Mitigation

Learn about CVE-2021-21041, a high-severity vulnerability in Acrobat Reader DC versions that could allow arbitrary code execution. Find details on impact, affected systems, and mitigation steps.

Acrobat Reader DC versions are affected by a use-after-free vulnerability, allowing an unauthenticated attacker to execute arbitrary code in the context of the current user.

Understanding CVE-2021-21041

This CVE involves a use-after-free vulnerability in Adobe Acrobat Reader DC versions, potentially leading to arbitrary code execution.

What is CVE-2021-21041?

Acrobat Reader DC versions 2020.013.20074 and earlier, 2020.001.30018 and earlier, and 2017.011.30188 and earlier are affected by a use-after-free vulnerability. This flaw could be exploited by an unauthenticated attacker to execute arbitrary code in the current user's context, requiring user interaction by opening a malicious file.

The Impact of CVE-2021-21041

The vulnerability has a CVSS base score of 7.8, indicating a high severity level. With a low attack complexity and required user interaction, the impact includes high confidentiality, integrity, and availability impacts.

Technical Details of CVE-2021-21041

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability stems from a use-after-free issue in Adobe Acrobat Reader DC, potentially leading to arbitrary code execution.

Affected Systems and Versions

Acrobat Reader DC versions including 2020.013.20074, 2020.001.30018, and 2017.011.30188 are affected by this vulnerability.

Exploitation Mechanism

An unauthenticated attacker could exploit this vulnerability by tricking a victim into opening a malicious file.

Mitigation and Prevention

Protective measures and actions to mitigate the risks associated with CVE-2021-21041.

Immediate Steps to Take

Users should update Acrobat Reader to the latest version to mitigate the risk of exploitation.

Long-Term Security Practices

Employing good security practices, such as avoiding opening files from untrusted sources, can enhance overall system security.

Patching and Updates

Regularly apply security patches and updates provided by Adobe to address known vulnerabilities and enhance system security.

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