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CVE-2023-31125

22
FAUCET Score

CVE-2023-31125 is an uncaught exception vulnerability in Engine.IO, affecting versions 5.1.0 and later, as well as Socket.IO versions 4.1.0 and later. A specially crafted HTTP request can trigger an uncaught exception, leading to a denial of service by crashing the Node.js process. With a CVSS score of 6.5 (Medium), this vulnerability has a low attack complexity and high impact on availability, requiring no user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.1.0, < 6.4.2CPE matchmatch criteria
cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.33%
Probability of exploitation in next 30 days
EPSS Percentile
68.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0133 is in the 82nd percentile among its peer group of 21,974 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: engine.ioFixed in: 6.4.2

Vendor Advisories (2)

redhatCVE-2023-31125Moderate

engine.io: Uncaught exception in engine.io

May 8, 2023
npmGHSA-q9mw-68c2-j6m5medium

engine.io Uncaught Exception vulnerability

May 3, 2023

References

github.com / socketio/engine.io/commit/fc480b4f305e16fe5972cf337d055e598372dc44
Patch
github.com / socketio/engine.io/releases/tag/6.4.2
Release Notes
github.com / socketio/engine.io/security/advisories/GHSA-q9mw-68c2-j6m5
Vendor Advisory
security.netapp.com / advisory/ntap-20230622-0002