CVE-2021-26876: 
vulnerability analysis and mitigation

OpenType Font Parsing Remote Code Execution Vulnerability (CVE-2021-26876) is a security flaw affecting Microsoft Windows systems. The vulnerability was disclosed and assigned on February 8, 2021, with patches released in March 2021. The affected systems include multiple versions of Windows 10 (1803, 1809, 1909, 2004, 20H2) and Windows Server 2016 (NVD).

The vulnerability has received a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. This indicates that the vulnerability can be exploited remotely, requires low attack complexity, needs no privileges, but does require user interaction. The potential impact includes high severity ratings for confidentiality, integrity, and availability (NVD).

If successfully exploited, this vulnerability could allow an attacker to achieve remote code execution with the potential for complete system compromise. The high CVSS scores for confidentiality, integrity, and availability (all rated as High) indicate that successful exploitation could result in significant impact to affected systems (NVD).

The vulnerability requires user interaction for successful exploitation, as indicated by the UI:R component in the CVSS vector. It can be accessed over the network (AV:N) and requires low attack complexity (AC:L) with no privileges needed (PR:N) (NVD).

Microsoft has released security updates to address this vulnerability. The fixes are available through various KB updates including KB5000802, KB5000808, KB5000809, and KB5000822 for different versions of Windows (Rapid7).