What’s Vulnerable › Vulnerabilities

CVE-2018-20311

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-07 · updated 2026-06-17
• Weakness: CWE-125

Description

Foxit Reader before 9.5, and PhantomPDF before 8.3.10 and 9.x before 9.5, has a proxyCPDFAction race condition that can cause a stack-based buffer overflow or an out-of-bounds read.

Affected products

• Foxit PhantomPDF: before 8.3.10; from 9.0 before 9.5 — fixed in 8.3.10, 9.5
• Foxit Reader: before 9.5 — fixed in 9.5

How to fix

Upgrade to a fixed version: Foxit PhantomPDF 8.3.10, 9.5; Foxit Reader 9.5. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2018-20311 or the next vulnerability affects your stack