Prototype Pollution in Fastify Fastify-Multipart
CVE-2021-23597
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).
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.020 (80.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Fastify Fastify-Multipart
- Fastify-Multipart — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-2395480 (Exploit, Patch, Third Party Advisory)
- github.com/fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609… (Patch, Third Party Advisory)
- github.com/fastify/fastify-multipart/releases/tag/v5.3.1 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-23597?
- CVE-2021-23597 is a high-severity vulnerability in Fastify Fastify-Multipart, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2022-02-11.
- How severe is CVE-2021-23597?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-23597 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.