CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2022-21676
High (7.5) in socket engine.io. EPSS 2.8% chance of exploitation in the next 30 days. Fixed in engine.io 4.1.2, 5.2.1, 6.1.1.
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.
Severity
- EPSS
- 2.8% chance of exploitation in the next 30 days; higher than 86% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-755, CWE-754
- Published
- Modified
- Record from
- the NVD, synced
Affected
- socket:engine.io
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-273r-mgr4-v34f | npm | engine.io | >=4.0.0 <4.1.2 | 4.1.2 |
| GHSA-273r-mgr4-v34f | npm | engine.io | >=5.0.0 <5.2.1 | 5.2.1 |
| GHSA-273r-mgr4-v34f | npm | engine.io | >=6.0.0 <6.1.1 | 6.1.1 |
References
- 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