CVE-2021-21822

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-10 · 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 10.1.3.37598. A specially crafted PDF document can trigger the reuse of previously free memory, which can lead to arbitrary code execution. An attacker needs to trick the user into opening a malicious file or site to trigger this vulnerability if the browser plugin extension is enabled.

Affected products

Foxit Reader: 10.1.3.37598

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1287
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1287

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