CVE-2017-6030
MEDIUMEPSS 80th pctlDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Exploit Intelligence
Elevated risk: more likely to be exploited than 80% of all known CVEs.
References
Related Vulnerabilities
Other CWE-343 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2017-7901 | High | 8.6 | 6.7% | - | - |
| CVE-2014-5409 | Medium | 6.4 | 2.7% | - | - |
| CVE-2026-32694 | Medium | 6.6 | 0.3% | - | Fix |
| CVE-2026-33221 | Medium | 5.3 | 0.2% | - | Fix |
Common questions
How do I fix CVE-2017-6030?
No published fix for CVE-2017-6030 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2017-6030 being actively exploited?
Not that we know of. CVE-2017-6030 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 80% of all scored CVEs.
How severe is CVE-2017-6030?
CVE-2017-6030 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-04.