CVE-2021-26701: 
vulnerability analysis and mitigation

CVE-2021-26701 is a Remote Code Execution (RCE) vulnerability affecting .NET Core and related Microsoft technologies. The vulnerability was discovered in early 2021 and affects multiple versions of .NET Core, including versions 5.0 up to 5.0.6, 2.1 up to 2.1.28, and 3.1 up to 3.1.15 (NVD).

The vulnerability has received a CVSS v3.1 base score of 9.8 (Critical) from NIST and 8.1 (High) from Microsoft. The vulnerability is characterized by its network attack vector (AV:N), low attack complexity (AC:L), and no requirements for privileges (PR:N) or user interaction (UI:N). The scope is unchanged (S:U) with high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) (NVD).

The vulnerability could allow an attacker to execute remote code on affected systems. The high CVSS scores indicate that successful exploitation could lead to complete compromise of the system's confidentiality, integrity, and availability (NVD).

The vulnerability is characterized by its network-based attack vector and requires no user interaction or special privileges for exploitation. While specific exploit details are not publicly disclosed, the high severity ratings suggest significant exploitability potential (NVD).

Microsoft has released security updates to address this vulnerability. For .NET Core 3.1, users should upgrade to version 3.1.13 or later. PowerShell users should upgrade to version 7.1.3 or higher. Docker images containing PowerShell should be updated to version 7.1.3.20270 or later (Palo Alto, Fedora Update).