CVE-2021-28550

8.8 HIGH CISA KEV - Actively Exploited
Published: September 02, 2021 Modified: October 23, 2025

Description

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://helpx.adobe.com/security/products/acrobat/apsb21-29.html
Source: psirt@adobe.com
Release Notes Vendor Advisory
https://helpx.adobe.com/security/products/acrobat/apsb21-29.html
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28550
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Third Party Advisory US Government Resource

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
8.8 / 10.0
EPSS (Exploit Probability)
14.2%
94th percentile
Exploitation Status
Actively Exploited
Remediation due: 2021-11-17

Weaknesses (CWE)

Affected Vendors

apple adobe microsoft