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 (3)

Core 3

Core References

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.json

View Writeup ZIP pw:eip

Third Party Advisory, US Government Resource x_refsource_misc

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

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/97254

Scores

CVSS v3 6.5

EPSS 0.0212

EPSS Percentile 79.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-331 CWE-343

Status published

Products (8)

None/Schneider Electric Modicon PLCs Schneider Electric Modicon PLCs

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

Schneider Electric/Modicon M221 < 1.5.0.0

Schneider Electric/Modicon M241 < 4.0.5.11

Schneider Electric/Modicon M251 < 4.0.5.11

schneider-electric/modicon_m221_firmware < 1.1.1.5

schneider-electric/modicon_m241_firmware < 4.0.3.20

schneider-electric/modicon_m251_firmware < 4.0.3.20

Published Jun 30, 2017

Tracked Since Feb 18, 2026