CVE-2022-41940Network attack vector

Process crash via unhandled invalid-upgrade socket error

Published Nov 22, 2022 · Updated Apr 22, 2025

Uncaught exception in Engine.IO before 3.6.1 and 4.0.0 through 6.2.0 allows remote authenticated users to crash Node.js. The invalid-upgrade timeout calls socket.end() without an error listener, so an HTTP/2 upgrade reset emits an unhandled ECONNRESET. A reachable Engine.IO server and low-privileged access are required; successful requests terminate the hosting process and interrupt its service.

CVSS severity7.1
High
EPSS probability1.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception in Engine.IO before 3.6.1 and 4.0.0 through 6.2.0 allows remote authenticated users to crash Node.js. The invalid-upgrade timeout calls socket.end() without an error listener, so an HTTP/2 upgrade reset emits an unhandled ECONNRESET. A reachable Engine.IO server and low-privileged access are required; successful requests terminate the hosting process and interrupt its service.

The record

CVE
CVE-2022-41940
Published
Nov 22, 2022
Updated
Apr 22, 2025
Vendor
Socket.IO
Product
Engine.IO
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=< 3.6.1
  2. Affected versionversion=>= 4.0.0, < 6.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Socket.IO · Engine.IOversion=< 3.6.1; version=>= 4.0.0, < 6.2.1

Published CVSS scores

6.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1GitHub CNACVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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