Westermo Lynx Cleartext Transmission of Sensitive Information

published 2024-02-06 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-45115

cvss: 5.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

An attacker with access to the network where the affected devices are located could maliciously actions to obtain, via a sniffer, sensitive information exchanged via TCP communications.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-023-04 updated 2024-01-23 cvss 5.7

Westermo Lynx 206-F2G

Westermo Lynx Firmware 4.24. Westermo Lynx Model L206-F2G1
affected: mitigation “Westermo recommends following best practices for hardening, such as restricting access, disable unused services (attack surface reduction) etc., to mitigate the reported vulnerabilities.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-02-07)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.7	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD	3.1	5.7	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

Westermo Lynx

Classification

Weakness

CWE-319 Cleartext Transmission of Sensitive Information

References

cisa.gov /news-events/ics-advisories/icsa-24-023-04
third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-40544
NVD CVE-2023-40544

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Summary