What’s Vulnerable › Vulnerabilities

CVE-2020-35931

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-31 · updated 2026-06-17
• Weakness: CWE-754

Description

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

• Foxit Reader: before 10.1.1; before 4.1.1 — fixed in 10.1.1, 4.1.1
• Foxit PhantomPDF: before 9.7.5; from 10.0.0 before 10.1.1; before 4.1.1 — fixed in 10.1.1, 4.1.1, 9.7.5

How to fix

Upgrade to a fixed version: Foxit Reader 10.1.1, 4.1.1; Foxit PhantomPDF 10.1.1, 4.1.1, 9.7.5. Check the vendor advisory for mitigations.

References

• https://www.foxitsoftware.com/support/security-bulletins.html
• https://www.foxitsoftware.com/support/security-bulletins.html

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