Adobe Acrobat Reader DC AcroForm getItemAt Use-After-Free Remote Code Execution Vulnerability [CVE-2021-39839]
CVE number – CVE-2021-39839
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Adobe Acrobat Reader DC. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the handling of AcroForm fields. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.
Adobe has issued an update to correct this vulnerability.
More details can be found at:
https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.