What’s Vulnerable › Vulnerabilities

CVE-2021-23597: Denial of Service (DoS)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-02-11 · updated 2026-06-17
• Weakness: CWE-1321

Description

This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).

Affected products

• fastify-multipart: before 5.3.1 — fixed in 5.3.1

How to fix

Upgrade to a fixed version: fastify-multipart 5.3.1. Check the vendor advisory for mitigations.

References

• https://github.com/fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609e6066
• https://github.com/fastify/fastify-multipart/releases/tag/v5.3.1
• https://snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-2395480
• https://github.com/fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609e6066
• https://github.com/fastify/fastify-multipart/releases/tag/v5.3.1
• https://snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-2395480

Get alerted when CVE-2021-23597 or the next vulnerability affects your stack