CVE-2017-6030

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.

• CWE-343
• CWE-331

• http://www.securityfocus.com/bid/97254Third Party Advisory, VDB Entry
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.json
• https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02Third Party Advisory, US Government Resource
• http://www.securityfocus.com/bid/97254Third Party Advisory, VDB Entry
• https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02Third Party Advisory, US Government Resource

Published

Jun 30, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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