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Vulnerability record · CVE-2020-36048 · published 8 January 2021

CVE-2020-36048: Socket engine.io uncontrolled resource consumption vulnerability

Socket · Engine.Io

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.

7.5 CVSS 3.1 High EPSS 3.2% · top 12.2% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score, v2 5.0
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.caller.xyz/socketio-engineio-dos/ ExploitThird Party Advisory
https://github.com/bcaller/kill-engine-io Third Party Advisory
https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b PatchThird Party Advisory
https://blog.caller.xyz/socketio-engineio-dos/ ExploitThird Party Advisory
https://github.com/bcaller/kill-engine-io Third Party Advisory
https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-36048), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.