CVE-2023-40515Network attack vector

Unauthenticated service interruption via invalid joinAddUser input

Published May 3, 2024 · Updated Sep 18, 2024

Improper input validation in LG Simple Editor 3.21.0 allows remote attackers to interrupt the service through joinAddUser requests. The joinAddUser method fails to validate attacker-controlled input before processing it, causing a denial-of-service condition. No authentication or user interaction is required, and the published impact is limited to availability.

CVSS severity7.5
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in LG Simple Editor 3.21.0 allows remote attackers to interrupt the service through joinAddUser requests. The joinAddUser method fails to validate attacker-controlled input before processing it, causing a denial-of-service condition. No authentication or user interaction is required, and the published impact is limited to availability.

The record

CVE
CVE-2023-40515
Published
May 3, 2024
Updated
Sep 18, 2024
Vendor
LG Electronics
Product
LG Simple Editor
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=*
  2. Affected versionversion=LG Simple Editor 3.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LG Electronics · LG Simple Editorversion=*; version=LG Simple Editor 3.21.0

Published CVSS scores

7.5Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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