CVE-2021-28550 : What You Need to Know

Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution.

Understanding CVE-2021-28550

Adobe Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier), and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

What is CVE-2021-28550?

Adobe Acrobat Reader is susceptible to a Use After Free vulnerability that allows attackers to execute arbitrary code in the context of the current user, potentially leading to system compromise. The attacker needs the victim to interact by opening a malicious file.

The Impact of CVE-2021-28550

This critical vulnerability can result in high impact on confidentiality, integrity, and availability of the affected systems. An unauthenticated attacker could exploit this issue to execute arbitrary code, posing a significant risk to user data and system security.

Technical Details of CVE-2021-28550

Adobe Acrobat Reader DC versions 2021.001.20150, 2020.001.30020, and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An attacker could trigger the vulnerability by persuading a victim to open a malicious file, leading to arbitrary code execution and potential system compromise.

Vulnerability Description

The vulnerability arises from a Use After Free flaw in Adobe Acrobat Reader, enabling attackers to execute arbitrary code in the context of the user. It requires user interaction to exploit, making it critical for users to exercise caution when opening files.

Affected Systems and Versions

Vendor: Adobe
Product: Acrobat Reader
Affected Versions:
Acrobat Reader DC (2021.001.20150) and earlier
Acrobat Reader DC (2020.001.30020) and earlier
Acrobat Reader DC (2017.011.30194) and earlier

Exploitation Mechanism

Exploiting CVE-2021-28550 requires an attacker to trick a user into opening a malicious file. Upon successful exploitation, the attacker can execute arbitrary code within the user's context, potentially leading to system compromise.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-28550, users are advised to take immediate action and implement long-term security practices to enhance system resilience.

Immediate Steps to Take

Update Adobe Acrobat Reader to the latest version.
Exercise caution when opening files, especially from untrusted sources.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Educate users on safe browsing habits and file handling practices.

Patching and Updates

Adobe has released security updates to address the Use After Free vulnerability in Adobe Acrobat Reader. Users should apply these patches promptly to protect against potential exploitation.