CVE-2021-39845: 
Adobe Acrobat Reader Continuous vulnerability analysis and mitigation

A stack overflow vulnerability was identified in Adobe Acrobat Reader DC affecting multiple versions: 2021.005.20060 and earlier, 2020.004.30006 and earlier, and 2017.011.30199 and earlier. The vulnerability stems from insecure handling of crafted PDF files, which could lead to memory corruption in the context of the current user. The vulnerability was assigned CVE-2021-39845 and was initially recorded on August 23, 2021 (CVE Details).

The vulnerability is classified as a stack overflow vulnerability that occurs when processing specially crafted PDF files. The issue manifests through insecure handling of PDF files, which can result in memory corruption. User interaction is required for exploitation, specifically requiring the victim to open a maliciously crafted PDF file in Acrobat Reader (Adobe Security).

When successfully exploited, this vulnerability can lead to memory corruption in the context of the current user. The impact is particularly significant given Adobe Acrobat Reader's widespread use in business and personal environments (CVE Details).

The vulnerability requires user interaction for successful exploitation, specifically the opening of a crafted PDF file in Acrobat Reader. This requirement somewhat mitigates the risk as it cannot be exploited without user intervention (Adobe Security).