CVE-2021-28550
Adobe Acrobat and Reader Use-After-Free Vulnerability
CVSS
—
No CVSS
EPSS
51.9%
p99
KEV
YES
Nov 3, 2021
Exploit Today
80
0-100
Published: — · Last modified: —
51.9%EPSS · 30 days52.0%
2026-09-162026-10-14
Product
Adobe / Acrobat and Reader
Vulnerability
Adobe Acrobat and Reader Use-After-Free Vulnerability
Added to KEV
Nov 3, 2021
Remediate by
Nov 17, 2021
Known ransomware use
No
Summary description
Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-28550
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-346218.6 HIG82.0%
KEV—75Adobe Acrobat and Reader Prototype Pollution Vulnerability49dCVE-2008-2992—99.9%
KEV—80Adobe Reader and Acrobat Input Validation Vulnerability—CVE-2007-5659—99.8%
KEV—80Adobe Acrobat and Reader Buffer Overflow Vulnerability—CVE-2021-21017—99.7%
KEV—80Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability—CVE-2009-3459—99.7%
KEV—80Adobe Acrobat and Reader Heap-Based Buffer Overflow Vulnerability—CVE-2009-3953—99.7%
KEV—80Adobe Acrobat and Reader Universal 3D Remote Code Execution Vulnerability—