CVE-2021-23597: 
JavaScript vulnerability analysis and mitigation

The vulnerability CVE-2021-23597 affects the package fastify-multipart before version 5.3.1. This security issue was discovered by Alessio Della Libera of Snyk Research Team and was disclosed on February 7, 2022. The vulnerability allows attackers to crash the application by providing a name=constructor property, representing a bypass of a previous vulnerability (CVE-2020-8136) (Snyk Advisory).

The vulnerability is classified as a Denial of Service (DoS) issue with a CVSS v3.1 base score of 7.5 (HIGH). The attack vector is network-accessible, requires low attack complexity, needs no privileges or user interaction, and has an unchanged scope. While there is no impact on confidentiality and integrity, the vulnerability can result in a total loss of availability of the affected component (Snyk Advisory).

When successfully exploited, this vulnerability can cause a complete crash of the application, resulting in a denial of service condition. The impact is primarily on the availability of the service, with no direct effect on confidentiality or integrity of the system (Snyk Advisory).

The recommended mitigation is to upgrade fastify-multipart to version 5.3.1 or higher. This version includes a security fix that prevents the exploitation of this vulnerability (GitHub Release, GitHub Patch).