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CVE-2017-6030

Schneider Electric Modicon PLCs Predictable Value Range from Previous Values

Published: Jun 30, 2017Updated: Jun 4, 2026 Sources: CVE List NVD csafCWE-343
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
2.1%
Top 20.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-343CWE-331

Affected Products

modicon m241 firmwareschneider-electricICS / OT / IoT
modicon m251 firmwareschneider-electricICS / OT / IoT
modicon m221 firmwareschneider-electricICS / OT / IoT
Modicon M221Schneider ElectricICS / OT / IoT
Modicon M241Schneider ElectricICS / OT / IoT
schneider-electriccommercialFRICS / OT / IoTaka schneider electric se
schneider electriccommercialFRICS / OT / IoTaka schneider-electric
and 1 more affected products View all →

Exploitability

Official Patch Available

References

http://www.securityfocus.com/bid/97254
securityfocus.com
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.json
github.com
https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02
ics-cert.us-cert.gov
and 8 more references View all →

Timeline

Published
Jun 30, 2017
Last Updated
Jun 4, 2026

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