What’s Vulnerable › Vulnerabilities

CVE-2021-40420

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-02-04 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader, version 11.1.0.52543. A specially-crafted PDF document can trigger the reuse of previously freed memory, which can lead to arbitrary code execution. An attacker needs to trick the user to open the malicious file to trigger this vulnerability. Exploitation is also possible if a user visits a specially-crafted, malicious site if the browser plugin extension is enabled.

Affected products

• Foxit Pdf Reader: 11.1.0.52543

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1429
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1429

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