CVE-2017-6026

Name: CVE-2017-6026
Creator: NVD / NIST
Published: 2017-06-30T03:29:00.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 31.82%

Last modified Jun 17, 2026

CVE-2017-6026 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. EPSS estimates a 31.82% chance of exploitation in the next 30 days.

Description

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

31.82%

98.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon M251 Firmware	<= 4.0.3.20
Schneider-Electric	Modicon M241 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
https://www.exploit-db.com/exploits/45918/Exploit, Third Party Advisory, VDB Entry
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
https://www.exploit-db.com/exploits/45918/Exploit, Third Party Advisory, VDB Entry

Timeline

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

Frequently Asked Questions

What is CVE-2017-6026?

How severe is CVE-2017-6026?

CVE-2017-6026 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 31.82% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6026?

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-2017-6026?

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

Scan your code now

Source: NVD / NIST