An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Mo…

published 2017-06-30 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15096

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.3%; EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits: 0; none known

An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251, all firmware versions. Log-in credentials are sent over the network with Base64 encoding leaving them susceptible to sniffing. Sniffed credentials could then be used to log into the web application.

Vendor advisories

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

cisa ICSA-17-089-02 updated 2017-03-30 cvss 7.5

Schneider Electric Modicon PLCs

Schneider Electric Software, LLC Modicon M221 < 1.5.0.0 Schneider Electric Software, LLC Modicon M241 < 4.0.5.11 Schneider Electric Software, LLC Modicon M251 < 4.0.5.11
affected: mitigation “SoMachineBasic, Version 1.5, is available”

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

Exploit prediction

2.25% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

n/a Schneider Electric Modicon PLCs

Classification

Weakness

CWE-522 Insufficiently Protected Credentials

References

ics-cert.us-cert.gov /advisories/ICSA-17-089-02
third-party-advisory, us-government-resource
securityfocus.com /bid/97254
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-6028
NVD CVE-2017-6028

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary