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Vulnerability record · CVE-2017-6026 · published 30 June 2017

CVE-2017-6026: Schneider-electric modicon m251 firmware vulnerability

Schneider Electric · Modicon M251 Firmware

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.

9.1 CVSS 3.1 Critical EPSS 32% · top 1.8% CWE-330 · CWE-330
9.1CVSS 3.1 base score, v2 6.4
32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/97254 Third Party AdvisoryVDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02 Third Party AdvisoryUS Government Resource
https://www.exploit-db.com/exploits/45918/ ExploitThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/97254 Third Party AdvisoryVDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02 Third Party AdvisoryUS Government Resource
https://www.exploit-db.com/exploits/45918/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-7487Schneider-electric ecostruxure machine expert insufficient verification of data authenticity vulnerabilityA CWE-345: Insufficient Verification of Data Authenticity vulnerability exists which could allow the attacker to execute malicious code on the Modico…EPSS 0.69%9.8CVE-2017-6028Schneider-electric modicon m241 firmware insufficiently protected credentials vulnerabilityAn Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251…EPSS 2.3%8.2CVE-2019-6820Schneider-electric modicon m100 firmware missing authentication for critical function vulnerabilityA CWE-306: Missing Authentication for Critical Function vulnerability exists which could cause a modification of device IP configuration (IP address,…EPSS 1.3%7.5CVE-2021-22699Schneider-electric modicon m241 firmware improper input validation vulnerabilityImproper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service w…EPSS 0.98%7.5CVE-2020-7488Schneider-electric ecostruxure machine expert cleartext transmission vulnerabilityA CWE-319: Cleartext Transmission of Sensitive Information vulnerability exists which could leak sensitive information transmitted between the softwa…EPSS 0.88%6.9CVE-2025-13901Schneider-electric modicon m241 firmware improper resource shutdown vulnerabilityCWE-404 Improper Resource Shutdown or Release vulnerability exists that could cause partial Denial of Service on Machine Expert protocol when an unau…EPSS 0.46%6.5CVE-2017-6030Schneider-electric modicon m241 firmware vulnerabilityA predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Versi…EPSS 2.1%6.1CVE-2024-6528Schneider-electric modicon m241 firmware cross-site scripting vulnerabilityCWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that could cause a vulnerability le…EPSS 0.26%

Source: NIST National Vulnerability Database (record CVE-2017-6026), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.