CVE-2025-47944Public exploitNetwork attack vector

Process crash via premature busboy listener removal

Published May 19, 2025 · Updated May 20, 2025

Uncaught exception handling in Multer 1.4.4-lts.1 through 1.4.5-lts.2 allows remote attackers to crash Node.js applications. In makeMiddleware, cleanup removes every busboy listener before a malformed multipart stream emits its second error, leaving that event unhandled. An unauthenticated request must reach an Express upload route using affected middleware; the resulting exception terminates the hosting Node.js process.

CVSS severity7.5
High
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception handling in Multer 1.4.4-lts.1 through 1.4.5-lts.2 allows remote attackers to crash Node.js applications. In makeMiddleware, cleanup removes every busboy listener before a malformed multipart stream emits its second error, leaving that event unhandled. An unauthenticated request must reach an Express upload route using affected middleware; the resulting exception terminates the hosting Node.js process.

The record

CVE
CVE-2025-47944
Published
May 19, 2025
Updated
May 20, 2025
Vendor
body-parser
Product
Multer
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2025CVE publishedPublication date reported by the CVE source.
  2. May 20, 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=>=1.4.4-lts.1, <2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

body-parser · Multerversion=>=1.4.4-lts.1, <2.0.0

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-248Uncaught Exception
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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