CVE-2022-24434Public exploitNetwork attack vector

Service crash via uninitialized header variable

Published May 20, 2022 · Updated Sep 16, 2024

Denial of service in mscdex Dicer 0.3.1 and earlier allows remote attackers to crash Node.js servers via malformed multipart headers. HeaderParser.prototype._parseHeader treats a leading space or tab as a folded header and dereferences the uninitialized h variable as a header-map key. Any unauthenticated endpoint that parses attacker-controlled multipart/form-data can terminate repeatedly, interrupting the hosting service.

CVSS severity7.5
High
EPSS probability3.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in mscdex Dicer 0.3.1 and earlier allows remote attackers to crash Node.js servers via malformed multipart headers. HeaderParser.prototype._parseHeader treats a leading space or tab as a folded header and dereferences the uninitialized h variable as a header-map key. Any unauthenticated endpoint that parses attacker-controlled multipart/form-data can terminate repeatedly, interrupting the hosting service.

The record

CVE
CVE-2022-24434
Published
May 20, 2022
Updated
Sep 16, 2024
Vendor
mscdex
Product
Dicer
Classifications
CWE-248, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mscdex · Dicerversion=0 <unspecified

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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-248Uncaught Exception
T1190Exploit Public-Facing Application

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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