CVE-2017-6030

MEDIUM

Schneider Electric Modicon PLCs - Predictable Value Range

Title source: llm

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.

References (2)

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/97254

[Third Party Advisory, US Government Resource] https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02

Scores

CVSS v3 6.5

EPSS 0.0040

EPSS Percentile 60.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Details

CWE

CWE-331 CWE-343

Status published

Products (4)

schneider-electric/modicon_m241_firmware < 4.0.3.20

schneider-electric/modicon_m251_firmware < 4.0.3.20

schneider-electric/modicon_m221_firmware < 1.1.1.5

n/a/Schneider Electric Modicon PLCs < Schneider Electric Modicon PLCs

Published Jun 30, 2017

Tracked Since Feb 18, 2026