CVE-2021-34853: 
Foxit PDF Reader vulnerability analysis and mitigation

CVE-2021-34853 is a security vulnerability discovered in Foxit PDF Reader version 11.0.0.49893. The vulnerability allows remote attackers to execute arbitrary code on affected installations of the software. User interaction is required to exploit this vulnerability, as the target must visit a malicious page or open a malicious file (ZDI Advisory).

The vulnerability exists within the handling of Annotation objects in Foxit PDF Reader. The specific flaw results from the lack of validating the existence of an object prior to performing operations on the object, leading to a Use-After-Free condition. The vulnerability has been assigned a CVSS score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) (ZDI Advisory).

An attacker can leverage this vulnerability to execute arbitrary code in the context of the current process on affected installations of Foxit PDF Reader. The successful exploitation requires user interaction, such as opening a malicious file or visiting a malicious page (ZDI Advisory).

Foxit has issued an update to correct this vulnerability. Users are advised to update their installations to the latest version of the software to protect against this vulnerability (ZDI Advisory).