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CVE-2021-23597

25
FAUCET Score

CVE-2021-23597 is a denial-of-service vulnerability affecting the fastify-multipart package prior to version 5.3.1, specifically a bypass of CVE-2020-8136. It allows an unauthenticated attacker to crash the application by providing a crafted "name=constructor" property in a multipart request. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low complexity, leading to a complete loss of application availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.3.1CPE matchmatch criteria
cpe:2.3:a:fastify:fastify-multipart:*:*:*:*:*:fastify:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 63rd percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: fastify-multipartFixed in: 5.3.1

Vendor Advisories (1)

npmGHSA-qh73-qc3p-rjv2high

Uncaught Exception in fastify-multipart

Feb 11, 2022

References

github.com / fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609e6066
PatchThird Party Advisory
github.com / fastify/fastify-multipart/releases/tag/v5.3.1
Release NotesThird Party Advisory
snyk.io / vuln/SNYK-JS-FASTIFYMULTIPART-2395480
ExploitPatchThird Party Advisory