CVE-2021-21017
Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability
Adobe · Acrobat and Reader
Vulnerability details
Acrobat Acrobat and Reader contain a heap-based buffer overflow vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user.
Added to CISA KEV: 2021-11-03
Ransomware campaign use: Unknown
CISA due date: 2021-11-17
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC