CVE-2024-21521Public exploitNetwork attack vector

Process crash via unchecked numeric argument coercion

Published Jul 10, 2024 · Updated Jan 26, 2025

Denial of service in @discordjs/opus before 0.10.0 allows remote attackers to crash a Node.js process via crafted API arguments. The OpusEncoder constructor, setBitrate, applyEncoderCTL, and applyDecoderCTL coerce arguments with N-API ToNumber without first requiring numeric values; an object with a noncallable toString property makes N-API abort instead of raising a catchable JavaScript exception. Exploitation requires an application to pass attacker-controlled values into one of these library APIs, and the resulting impact is limited to termination of that hosting process.

CVSS severity7.5
High
EPSS probability0.60%
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 @discordjs/opus before 0.10.0 allows remote attackers to crash a Node.js process via crafted API arguments. The OpusEncoder constructor, setBitrate, applyEncoderCTL, and applyDecoderCTL coerce arguments with N-API ToNumber without first requiring numeric values; an object with a noncallable toString property makes N-API abort instead of raising a catchable JavaScript exception. Exploitation requires an application to pass attacker-controlled values into one of these library APIs, and the resulting impact is limited to termination of that hosting process.

The record

CVE
CVE-2024-21521
Published
Jul 10, 2024
Updated
Jan 26, 2025
Vendor
Discord.js
Product
@discordjs/opus
Classifications
CWE-20, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 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=0 <=*
  2. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discord.js · @discordjs/opusversion=0 <=*; version=0 <*

Published CVSS scores

7.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-20Improper Input Validation
CWE-400Uncontrolled Resource Consumption
T1499.004Application 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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