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High severity8.8NVD Advisory· Published Feb 4, 2022· Updated Jun 17, 2026

CVE-2021-40420

CVE-2021-40420

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Foxitsoftware/PDF Reader2 versions
    cpe:2.3:a:foxit:pdf_reader:11.1.0.52543:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:foxit:pdf_reader:11.1.0.52543:*:*:*:*:*:*:*
    • (no CPE)range: 11.1.0.52543
  • Foxit Software/PDF Readerdescription

Patches

Vulnerability mechanics

References

1

News mentions

0

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