vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2022-21676

Uncaught Exception in engine.io

HIGH
7.5
CVSS Score
Published: January 12, 2022 at 06:25 PM UTC
Updated: June 17, 2026 at 04:26 AM UTC
2 products affected across 2 vendorsEngine.ioEngine.io

Using engine.io by socketio?

Get instant alerts when new vulnerabilities affect engine.io - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.5
Exploit prediction
EPSS 3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Engine.io· Socketnpm
95%
4.0.0 ≤ v < 4.1.25.0.0 ≤ v < 5.2.16.0.0 ≤ v < 6.1.1
Affected range stops below 4.1.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.1, so it looks safe — our inference, not a vendor statement
Engine.io· Socketio
60%
v < 4.1.2v < 5.2.1v < 6.1.1
Affected range stops below 4.1.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.1, so it looks safe — our inference, not a vendor statement

References (8)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659db
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098c
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/releases/tag/4.1.2
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/releases/tag/5.2.1
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/releases/tag/6.1.1
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34f
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20220209-0002/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754CWE-755

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card