Schneider Electric Modicon PLCs Predictable Value Range from Previous Values
Priority LOW 39CWE-343Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02184 82nd percentileScored 2026-11-07
Fix Fixed Modicon M221 (Schneider Electric): 1.5.0.0Modicon M241 (Schneider Electric): 4.0.5.11+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Schneider Electric | Modicon M221 | before 1.5.0.0 | 1.5.0.0 | Patch available | CNA |
| Schneider Electric | Modicon M241 | before 4.0.5.11 | 4.0.5.11 | Patch available | CNA |
| Schneider Electric | Modicon M251 | before 4.0.5.11 | 4.0.5.11 | Patch available | CNA |
- Modicon M221 VendorSchneider Electric Affected before 1.5.0.0 Fixed in 1.5.0.0 Patch available CNA
- Modicon M241 VendorSchneider Electric Affected before 4.0.5.11 Fixed in 4.0.5.11 Patch available CNA
- Modicon M251 VendorSchneider Electric Affected before 4.0.5.11 Fixed in 4.0.5.11 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| 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:*:*:*:*:*:*:*:* | 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_m221_firmware:*:*:*:*:*:*:*:* | up to 1.1.1.5 | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_m221:-:*:*:*:*:*:*:* | 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
- 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_m221_firmware:*:*:*:*:*:*:*:* Versions up to 1.1.1.5 Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_m221:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
Remediation
- Fix · CNA Modicon M221 (Schneider Electric) Fixed in 1.5.0.0
- Fix · CNA Modicon M241 (Schneider Electric) Fixed in 4.0.5.11
- Fix · CNA Modicon M251 (Schneider Electric) Fixed in 4.0.5.11
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6030
- 2026-10-03 Alias added: GHSA-w3r9-mwpj-g2c7
References
More Schneider Electric Modicon M221 Firmware vulnerabilities
- TI-2018-05633 Improper access control in Schneider Electric Modicon M221, all references, all versions… CVSS 3.1CRITICAL 9.8
- TI-2018-05632 Authentication bypass by capture-replay in Schneider Electric Modicon M221, all… CVSS 3.1CRITICAL 9.8
- TI-2020-06012 Injection in SoMachine Basic EcoStruxure Machine Expert – Basic Modicon M100 Logic… CVSS 3.1CRITICAL 9.8
- TI-2020-17144 A CWE-760: Use of a One-Way Hash with a Predictable Salt vulnerability exists in Modicon… CVSS 3.1CRITICAL 9.8
- TI-2019-08172 Uncontrolled resource consumption in ABB 1SAP120600R0071 PM554-TP-ETH CVSS 3.1HIGH 7.5
- TI-2019-04853 Missing authentication in Modicon and PacDrive Controller, All versions of: Modicon M100… CVSS 3.1HIGH 8.2
Sources
- CVE-2017-6030 · CVE Program
- CVE-2017-6030 · NVD
- FIRST EPSS
- GHSA-w3r9-mwpj-g2c7 · 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