CVE-2017-6030

Name: CVE-2017-6030
Creator: NVD / NIST
Published: 2017-06-30T03:29:00.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.12%

Last modified Jun 17, 2026

CVE-2017-6030 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 2.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

2.12%

79.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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

References

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

Timeline

Published: Jun 30, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-6030?

How severe is CVE-2017-6030?

CVE-2017-6030 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.12% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6030?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-6030?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST