CVE-2022-21676

Name: CVE-2022-21676
Creator: NVD / NIST
Published: 2022-01-12T19:15:09.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.76%

Last modified Jun 17, 2026

CVE-2022-21676 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. EPSS estimates a 2.76% chance of exploitation in the next 30 days.

Description

Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the `engine.io` package starting from version `4.0.0`, including those who uses depending packages like `socket.io`. Versions prior to `4.0.0` are not impacted. A fix has been released for each major branch, namely `4.1.2` for the `4.x.x` branch, `5.2.1` for the `5.x.x` branch, and `6.1.1` for the `6.x.x` branch. There is no known workaround except upgrading to a safe version.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.76%

84.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Socket	Engine.Io	>= 4.0.0, < 4.1.2
Socket	Engine.Io	>= 5.0.0, < 5.2.1
Socket	Engine.Io	>= 6.0.0, < 6.1.1

References

https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874abPatch, Third Party Advisory
https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659dbPatch, Third Party Advisory
https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098cPatch, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/4.1.2Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/5.2.1Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/6.1.1Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34fThird Party Advisory
https://security.netapp.com/advisory/ntap-20220209-0002/Third Party Advisory
https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874abPatch, Third Party Advisory
https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659dbPatch, Third Party Advisory
https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098cPatch, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/4.1.2Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/5.2.1Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/releases/tag/6.1.1Release Notes, Third Party Advisory
https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34fThird Party Advisory
https://security.netapp.com/advisory/ntap-20220209-0002/Third Party Advisory

Timeline

Published: Jan 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21676?

How severe is CVE-2022-21676?

CVE-2022-21676 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.76% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21676?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21676?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST