CVE-2023-40143Network attack vector

Administrator-level JavaScript execution via forwarding domain injection

Published Feb 6, 2024 · Updated Aug 2, 2024

Cross-site scripting in Westermo Lynx L206-F2G1 firmware 4.24 allows remote authenticated users to execute JavaScript. The WebGUI accepts attacker-controlled content in forward.0.domain and renders it without neutralizing executable script content. An administrator account is required; successful injection exposes data exchanged between the device and its WebGUI client to the script.

CVSS severity5.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Westermo Lynx L206-F2G1 firmware 4.24 allows remote authenticated users to execute JavaScript. The WebGUI accepts attacker-controlled content in forward.0.domain and renders it without neutralizing executable script content. An administrator account is required; successful injection exposes data exchanged between the device and its WebGUI client to the script.

The record

CVE
CVE-2023-40143
Published
Feb 6, 2024
Updated
Aug 2, 2024
Vendor
Westermo
Product
Lynx
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=4.24
  2. Affected versionversion=L206-F2G1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Westermo · Lynxversion=4.24; version=L206-F2G1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4ICS-CERTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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