CVE-2024-37183

Credential and session theft via cleartext WebGUI traffic

Published Jun 20, 2024 · Updated Aug 2, 2024

Cleartext transmission in Westermo L210-F2G Lynx 4.21.0 allows attackers to capture WebGUI credentials and session IDs. When HTTP access is enabled, the WebGUI sends login credentials and session identifiers without transport encryption, exposing them to network sniffing. Man-in-the-middle attackers with adjacent-network visibility and passive user interaction can read those secrets, but this flaw does not alter data or interrupt service.

CVSS severity6.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in Westermo L210-F2G Lynx 4.21.0 allows attackers to capture WebGUI credentials and session IDs. When HTTP access is enabled, the WebGUI sends login credentials and session identifiers without transport encryption, exposing them to network sniffing. Man-in-the-middle attackers with adjacent-network visibility and passive user interaction can read those secrets, but this flaw does not alter data or interrupt service.

The record

CVE
CVE-2024-37183
Published
Jun 20, 2024
Updated
Aug 2, 2024
Vendor
Westermo
Product
L210-F2G
Classifications
CWE-319, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 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=4.21.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Westermo · L210-F2Gversion=4.21.0
Westermo · Lynx L210-F2G Firmwareversion=4.21.0

Published CVSS scores

6.9ICS-CERTCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.7ICS-CERTCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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