Digi Engine.IO up to 4.1.1/5.2.0/6.1.0 on Socket HTTP Request unusual condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as problematic has been found in Digi Engine.IO up to 4.1.1/5.2.0/6.1.0 on Socket. Affected is some unknown processing of the component HTTP Request Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-754. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was shared 01/13/2022 as GHSA-273r-mgr4-v34f. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2022-21676 since 11/16/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.1.2, 5.2.1 or 6.1.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 66f889fc1d966bf5bfa0de1939069153643874ab is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub, Inc.): 🔒



VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍


Class: Privilege escalation
CWE: CWE-754
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Engine.IO 4.1.2/5.2.1/6.1.1
Patch: 66f889fc1d966bf5bfa0de1939069153643874ab


11/16/2021 CVE assigned
01/13/2022 +58 days Advisory disclosed
01/13/2022 +0 days VulDB entry created
01/15/2022 +2 days VulDB last update


Advisory: GHSA-273r-mgr4-v34f
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2022-21676 (🔒)


Created: 01/13/2022 06:49 AM
Updated: 01/15/2022 12:54 PM
Changes: (2) advisory_confirm_url source_cve_nvd_summary
Complete: 🔍


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