CVE-2020-35931: Foxitsoftware Foxit Reader

High severity, CVSS 7.8. EPSS: 2.3% chance of exploitation in the next 30 days.

An issue was discovered in Foxit Reader before 10.1.1 (and before 4.1.1 on macOS) and PhantomPDF before 9.7.5 and 10.x before 10.1.1 (and before 4.1.1 on macOS). An attacker can spoof a certified PDF document via an Evil Annotation Attack because the products fail to consider a null value for a Subtype entry of the Annotation dictionary, in an incremental update.

Affected products

• Foxitsoftware Foxit Reader: before 10.1.1 (fixed in 10.1.1); before 4.1.1 (fixed in 4.1.1)
• Foxitsoftware Phantompdf: before 9.7.5 (fixed in 9.7.5); from 10.0.0, before 10.1.1 (fixed in 10.1.1); before 4.1.1 (fixed in 4.1.1)

Published 2020-12-31. Last modified 2026-06-17.