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CVE-2020-36049

24
FAUCET Score

CVE-2020-36049 describes a denial-of-service vulnerability in socket.io-parser versions prior to 3.4.1, where a large packet can lead to excessive memory consumption due to an inefficient concatenation approach. This vulnerability carries a high severity CVSS score of 7.5, indicating it can be exploited remotely with low complexity and without user interaction, resulting in high availability impact. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.4.1CPE matchmatch criteria
cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.59%
Probability of exploitation in next 30 days
EPSS Percentile
83.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0259 is in the 71st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: socket.io-parserFixed in: 3.3.2
npmpatch availablevia ghsa
Product: socket.io-parserFixed in: 3.4.1
redhatvendor investigatingvia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-rhel8
redhatno patchvia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: system

Vendor Advisories (2)

npmGHSA-xfhh-g9f5-x4m4high

Resource exhaustion in socket.io-parser

Jun 30, 2021
redhatCVE-2020-36049Important

yarnpkg-socket.io-parser: a denial of service (memory consumption) via a large packet because a concatenation approach is used

Jan 8, 2020

References

blog.caller.xyz / socketio-engineio-dos
ExploitThird Party Advisory
github.com / bcaller/kill-engine-io
Third Party Advisory
github.com / socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55
PatchThird Party Advisory