CVE-2025-24033Public exploitNetwork attack vector

Service interruption via undeleted temporary upload files

Published Jan 23, 2025 · Updated Feb 12, 2025

Resource exhaustion in Fastify @fastify/multipart before 8.3.1 and 9.0.0 through 9.0.2 allows remote attackers to consume disk space. The saveRequestFiles function writes multipart uploads to temporary files but omits cleanup when a client cancels an incomplete request, leaving its promise pending and the partial file on disk. An application must expose a multipart route that invokes saveRequestFiles; repeated unauthenticated aborted uploads can fill temporary storage and interrupt the hosting service.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Fastify @fastify/multipart before 8.3.1 and 9.0.0 through 9.0.2 allows remote attackers to consume disk space. The saveRequestFiles function writes multipart uploads to temporary files but omits cleanup when a client cancels an incomplete request, leaving its promise pending and the partial file on disk. An application must expose a multipart route that invokes saveRequestFiles; repeated unauthenticated aborted uploads can fill temporary storage and interrupt the hosting service.

The record

CVE
CVE-2025-24033
Published
Jan 23, 2025
Updated
Feb 12, 2025
Vendor
Fastify
Product
@fastify/multipart
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.3.1
  2. Affected versionversion=>= 9.0.0, < 9.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fastify · @fastify/multipartversion=< 8.3.1; version=>= 9.0.0, < 9.0.3

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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