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CVE-2020-36048

26
FAUCET Score

CVE-2020-36048 describes a denial-of-service vulnerability in Engine.IO versions prior to 4.0.0, specifically affecting the long polling transport. An unauthenticated attacker can exploit this by sending a crafted POST request, leading to resource exhaustion and impacting the availability of affected systems. While rated as high severity (CVSS 7.5), there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.0.0CPE matchmatch criteria
cpe:2.3:a:socket:engine.io:*:*:*:*:*:*:*:*

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
3.24%
Probability of exploitation in next 30 days
EPSS Percentile
87.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0324 is in the 77th percentile among its peer group of 51,553 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 (4)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: engine.ioFixed in: 3.6.0
redhatvendor investigatingvia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-builder-qemu-rhcos-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-rhel8

Vendor Advisories (2)

npmGHSA-j4f2-536g-r55mhigh

Resource exhaustion in engine.io

Feb 9, 2022
redhatCVE-2020-36048Important

yarnpkg-socket.io/engine.io: allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport

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/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b
PatchThird Party Advisory