CVE-2021-28550 CRITICAL

CVE-2021-28550: Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution

Vendor Adobe
Product Acrobat Reader
Weakness CWE-416
KEV Status Known Exploited
Published September 2, 2021
Last update October 21, 2025
View on NVD All CVEs

CVSS base score

9.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

September 2, 2021 CVE published
October 21, 2025 Record updated