n10do

Exploited Added to CISA's list May 20, 2026

Adobe Acrobat and Reader: Heap-Based Buffer Overflow Vulnerability

What to do: Update Adobe Acrobat or Reader from Help, Check for updates.

Affects
Adobe Acrobat and Reader
Identifier
CVE-2009-3459
What it is
Adobe Acrobat and Reader contain a heap-based buffer overflow vulnerability which could allow remote attackers to execute arbitrary code via a crafted PDF file that triggers memory corruption.
Official guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Details
National Vulnerability Database entry

"Exploited" means CISA has evidence attackers are using this flaw. Being on the list does not mean your device was attacked; it means the update matters.