TI-2021-17484 Aliases CVE-2021-40420 GHSA-fp63-vpqm-jj5g

Use after free in Foxit

HIGH 73CWE-416Published 2022-02-04 · Updated 2025-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.04687 91st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	Foxit	Foxit Reader 11.1.0.52543	—	No fix listed	CNA

Foxit Vendor— Affected Foxit Reader 11.1.0.52543 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:foxit:pdf_reader:11.1.0.52543:::::::*	11.1.0.52543	Vulnerable	Foxit

cpe:2.3:a:foxit:pdf_reader:11.1.0.52543:*:*:*:*:*:*:* Versions 11.1.0.52543 Vulnerable ·Foxit

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-40420
2026-10-03 Alias added: GHSA-fp63-vpqm-jj5g

References

Exploit 1

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

TI-2021-13823 Use after free in Foxit PDF Reader CVSS 3.1HIGH 7.8
TI-2025-23518 A memory corruption vulnerability exists in Foxit Reader 2025.1.0.27937 due to the use of… CVSS 3.1HIGH 8.8
TI-2024-33074 Use after free in Foxit Reader CVSS 3.1HIGH 8.8
TI-2024-32078 Use after free in Foxit Reader CVSS 3.1HIGH 8.8
TI-2024-19083 Use after free in Foxit Reader CVSS 3.1HIGH 8.8
TI-2024-17038 Use after free in Foxit Reader CVSS 3.1HIGH 8.8

See all 372 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences