A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon…
Priority MEDIUM 63CWE-330Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.3182 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Schneider Electric Modicon PLCs | Schneider Electric Modicon PLCs | — | No fix listed | CNA |
- Schneider Electric Modicon PLCs Vendor— Affected Schneider Electric Modicon PLCs Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:* | up to 4.0.3.20 | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_m251:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Schneider Electric |
| cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:* | up to 4.0.3.20 | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_m241:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Schneider Electric |
- cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:* Versions up to 4.0.3.20 Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_m251:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
- cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:* Versions up to 4.0.3.20 Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_m241:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6026
- 2026-10-03 Alias added: GHSA-c4x2-m5w5-m3rx
References
Exploit 1
More Schneider Electric Modicon M241 Firmware vulnerabilities
- TI-2017-03938 Insufficiently protected credentials in Schneider Electric Modicon PLCs CVSS 3.1CRITICAL 9.8
- TI-2019-04853 Missing authentication in Modicon and PacDrive Controller, All versions of: Modicon M100… CVSS 3.1HIGH 8.2
- TI-2020-06010 Insufficient verification of data authenticity in EcoStruxure Machine Expert SoMachine… CVSS 3.1CRITICAL 9.8
- TI-2020-06011 Cleartext transmission of sensitive information in EcoStruxure Machine Expert SoMachine… CVSS 3.1HIGH 7.5
- TI-2017-03940 Schneider Electric Modicon PLCs Predictable Value Range from Previous Values CVSS 3.1MEDIUM 6.5
- TI-2025-12703 CWE-404 Improper Resource Shutdown or Release vulnerability exists that could cause… CVSS 4.0MEDIUM 6.9
Sources
- CVE-2017-6026 · CVE Program
- CVE-2017-6026 · NVD
- FIRST EPSS
- GHSA-c4x2-m5w5-m3rx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences