CVE-2021-21831

Name of the Vulnerable Software and Affected Versions Foxit Software’s PDF Reader version 10.1.3.37598

Description A use-after-free vulnerability exists in the JavaScript engine of Foxit Software’s PDF Reader. 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.

Recommendations For version 10.1.3.37598, consider disabling the JavaScript engine in the PDF Reader until a patch is available. Restrict access to malicious sites and avoid opening suspicious PDF documents to minimize the risk of exploitation. As a temporary workaround, disable the browser plugin extension to prevent exploitation through malicious sites.