CVE-2021-21831: Use After Free

Published Aug 5, 2021

Updated

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 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 Software

1 affected component

Foxit PDF Reader=10.1.3.37598

Event History

Aug 5, 2021

CVE Published

via MITRE·08:07 PM

Data Sourced

via MITRE·08:07 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2021-21831?

CVE-2021-21831 is considered a critical vulnerability as it can lead to arbitrary code execution.

How do I fix CVE-2021-21831?

To fix CVE-2021-21831, upgrade to a later version of Foxit PDF Reader that addresses this use-after-free vulnerability.

What versions are affected by CVE-2021-21831?

CVE-2021-21831 affects Foxit Software’s PDF Reader version 10.1.3.37598.

How does CVE-2021-21831 work?

CVE-2021-21831 exploits a use-after-free condition in the JavaScript engine of the affected PDF Reader, allowing potential arbitrary code execution.

Can CVE-2021-21831 be exploited remotely?

Yes, CVE-2021-21831 can be exploited remotely if a user is tricked into opening a specially crafted PDF document.