CVE-2017-6030 json
Schneider Electric Modicon PLCs Predictable Value Range from Previous Values
published 2017-06-30 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15098
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Schneider Electric Modicon M221 1.5.0.0
- Schneider Electric Modicon M241 4.0.5.11
- Schneider Electric Modicon M251 4.0.5.11
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-17-089-02 updated cvss 6.5
Schneider Electric Modicon PLCs
-
Schneider Electric Software, LLC Modicon M221 < 1.5.0.0 Schneider Electric Software, LLC Modicon M241 < 4.0.5.11 Schneider Electric Software, LLC Modicon M251 < 4.0.5.11affected: mitigation “SoMachineBasic, Version 1.5, is available”
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
2.18% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:N/I:P/A:P |
Affected products
- Schneider Electric Modicon M221
- Schneider Electric Modicon M241
- Schneider Electric Modicon M251
Classification
References
-
ics-cert.us-cert.gov
/advisories/ICSA-17-089-02
third-party-advisory, us-government-resource
-
securityfocus.com
/bid/97254
vdb-entry, third-party-advisory
- github.com /cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.json
Sources
- CVE List CVE-2017-6030
- NVD CVE-2017-6030
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.