CVE-2017-6030

moderate-risk
Published 2017-06-30

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.

Do I need to act?

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0.40% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (3)

Modicon M241 Firmware
Modicon M251 Firmware
Modicon M221 Firmware

Affected Vendors

Schneider-Electric

References (4)

Third Party Advisory http://www.securityfocus.com/bid/97254
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02
Third Party Advisory http://www.securityfocus.com/bid/97254
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02
35
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 2/34 · Minimal
Exposure 9/34 · Low