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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.

PUBLISHED Reserved 2017-02-16 | Published 2017-06-30 | Updated 2026-06-04 | Assigner icscert

Problem types

CWE-343

Product status

Default status
unaffected

Any version before 1.5.0.0
affected

Default status
unaffected

Any version before 4.0.5.11
affected

Default status
unaffected

Any version before 4.0.5.11
affected

Credits

David Formby and Raheem Beyah of Georgia Tech and Fortiphyd Logic, Inc. reported the identified vulnerabilities. finder

References

ics-cert.us-cert.gov/advisories/ICSA-17-089-02

www.securityfocus.com/bid/97254 (97254) vdb-entry

ics-cert.us-cert.gov/advisories/ICSA-17-089-02

www.securityfocus.com/bid/97254 (97254) vdb-entry

github.com/...p/csaf_files/OT/white/2017/icsa-17-089-02.json

cve.org (CVE-2017-6030)

nvd.nist.gov (CVE-2017-6030)

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