CVE-2021-21017
Adobe Acrobat and Reader Heap-based Buffer Overflow Vulnerability
IN CISA KEV
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.
- Vendor
- Adobe
- Product
- Acrobat and Reader
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-122
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2021-11-03
- Due date
- 2021-11-17
- Ransomware use
- Unknown
- Required action
- Apply updates per vendor instructions.
EPSS
86.3% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.