CVE-2021-38563: Foxit PDF Reader

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size (derived from a /Size entry) is smaller than the maximum indirect object number, and thus there is an attempted incorrect array access (leading to a NULL pointer dereference, or out-of-bounds read or write).

Affected products

• Foxit PDF Reader: up to and including 11.0.0.0510
• Foxitsoftware PDF Editor: up to and including 11.0.0.0510

Published 2021-08-11. Last modified 2026-06-17.