November 3, 2021 · Applied Cybernetics Group
CVE-2021-21017 — Adobe Acrobat and Reader
Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Adobe
- Product
- Acrobat and Reader
- EPSS
- 99.7th percentile (score 0.862, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1204.002 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-21017
CISA short description
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.
Required action
Apply updates per vendor instructions.