CVE-2020-16920: 
vulnerability analysis and mitigation

CVE-2020-16920 is a vulnerability discovered in the Windows Application Compatibility Client Library that was disclosed in October 2020. The vulnerability stems from improper handling of registry operations in the Windows Application Compatibility Client Library. This security flaw affects various versions of Microsoft Windows operating systems (CVE Details).

The vulnerability is classified as an elevation of privilege vulnerability with a CVSS v3.1 score indicating high severity (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The technical issue arises from improper handling of registry operations within the Windows Application Compatibility Client Library (NVD).

When successfully exploited, this vulnerability allows an attacker to gain elevated privileges on the affected system. The impact is significant as it could enable an attacker to execute code with higher privileges than they initially had access to (Rapid7).

To exploit this vulnerability, an attacker would first need to achieve code execution on the target system. Once this prerequisite is met, the attacker could run a specially crafted application to elevate their privileges (CVE Details).

Microsoft has addressed this vulnerability by releasing security updates that ensure the Windows Application Compatibility Client Library properly handles registry operations. The fix is available through various KB updates for different versions of Windows, including Windows 10, Windows Server 2012, Windows Server 2016, and Windows Server 2019 (Rapid7).