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» GHSA-j4f2-536g-r55m
Description
Engine.IO before 4.0.0 and 3.6.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.
Basic information
Type
reviewed
Severity
high Advisory on GitHub
Open advisory ↗ Repository advisory
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Source code
Browse source ↗ Published (advisory)
2022-02-09 22:29:04 UTC
Updated
2025-05-29 23:06:35 UTC
GitHub reviewed
2021-04-06 22:58:33 UTC
NVD published
2021-01-07
EPSS Score
Score
Percentile
0.50%
66.06%
CVSS Scores
Base score
Version
Severity
Vector
7.5
3.1
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
CWEs
CWE id
Name
CWE-400
Uncontrolled Resource Consumption
Credits
darrachequesne
(analyst)
G-Rath
(analyst)
decsecre583
(analyst)
Affected packages (1)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
npm
engine.io < 3.6.0
3.6.0
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cvelogic
Threat Intelligence