---
cve: "CVE-2022-21676"
severity: "HIGH"
cvss: 7.5
epss: "2.8%"
vendor: "socketio"
kev: false
exploited: false
published: "2022-01-12 18:25:15"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T04:14:04+02:00"
---

# CVE-2022-21676

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- c6315af44826b87f6802574f1ef79dfa63777fab (Commit)
- d36199cfe03caac96f5e84326561e9ccd460df1e (Commit)

## Referenzen

- <https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34f>
- <https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab>
- <https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659db>
- <https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098c>
- <https://github.com/socketio/engine.io/releases/tag/4.1.2>
- <https://github.com/socketio/engine.io/releases/tag/5.2.1>
- <https://github.com/socketio/engine.io/releases/tag/6.1.1>
- <https://security.netapp.com/advisory/ntap-20220209-0002/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2022-21676) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_