CVE-2021-40420 — HIGH (8.8)

Vulnerability 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.

CVSS Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Foxit	Pdf Reader	11.1.0.52543

Related Weaknesses (CWE)

CWE-416

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1429ExploitTechnical DescriptionThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1429ExploitTechnical DescriptionThird Party Advisory

FAQ

What is CVE-2021-40420?

CVE-2021-40420 is a vulnerability with a CVSS score of 8.8 (HIGH). 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, ...

How severe is CVE-2021-40420?

CVE-2021-40420 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-40420?

Check the references section above for vendor advisories and patch information. Affected products include: Foxit Pdf Reader.