CVE-2017-6028

Name: CVE-2017-6028
Creator: NVD / NIST
Published: 2017-06-30T03:29:00.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.25%

Last modified Jun 17, 2026

CVE-2017-6028 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 2.25% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.25%

80.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon M241 Firmware	<= 4.0.3.20
Schneider-Electric	Modicon M251 Firmware	<= 4.0.3.20

References

http://www.securityfocus.com/bid/97254Third Party Advisory, VDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02Third Party Advisory, US Government Resource
http://www.securityfocus.com/bid/97254Third Party Advisory, VDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02Third Party Advisory, US Government Resource

Timeline

Published: Jun 30, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-6028?

How severe is CVE-2017-6028?

CVE-2017-6028 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.25% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6028?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-6028?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST