CVE-2021-34831: 
Foxit PDF Reader vulnerability analysis and mitigation

CVE-2021-34831 is a use-after-free vulnerability affecting Foxit Reader version 10.1.4.37651. The vulnerability was discovered and reported by Xu Peng from UCAS and Wang Yanhao from QiAnXin Technology Research Institute, with public disclosure on July 30, 2021 (ZDI Advisory).

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

If successfully exploited, this vulnerability allows remote attackers to execute arbitrary code in the context of the current process on affected installations of Foxit Reader (ZDI Advisory).

The vulnerability requires user interaction to exploit, specifically the target must visit a malicious page or open a malicious file. The vulnerability was reported to the vendor on May 13, 2021, and was publicly disclosed on July 30, 2021 (ZDI Advisory).

Foxit has issued an update to correct this vulnerability. Users should update to the latest version of the software through the vendor's official website (ZDI Advisory).