CVE-2021-23597 Denial of Service (DoS)
An attacker can crash the application by sending a multipart request with a specific property name, affecting users of the fastify-multipart library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-23597?
CVE-2021-23597 is a high-severity denial of service vulnerability in fastify-multipart, published on 11 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-1321
Which versions are affected by CVE-2021-23597?
2 open source packages ship an affected version, including fastify-multipart. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fastify-multipart npm | All versions | 5.3.1 |
fastify-multipart npm | All versions | 5.3.1 |
Products include Fastify Fastify-Multipart.
How do I fix CVE-2021-23597?
Upgrade fastify-multipart to 5.3.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-23597 being exploited?
There is no known exploitation of CVE-2021-23597 in the wild and no public exploit code.
Other vulnerabilities in fastify-multipart
- CVE-2026-18549 @fastify/multipart vulnerable to Denial of Service via aborted upload after fileSize limit
- CVE-2026-19474 @fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload
- CVE-2023-25576 @fastify/multipart vulnerable to DoS due to unlimited number of parts
- CVE-2020-8136 Uncontrolled Resource Consumption in fastify-multipart
Sources
Also known as GHSA-qh73-qc3p-rjv2, SNYK-JS-FASTIFYMULTIPART-2395480.