No exploitation reported

CVE-2017-6026

No exploitation reported by the sources we read.

Published2017-06-30
WeaknessCWE-330

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.

Timeline

dates in UTC

2017-06-3003:29CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6026?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6026?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric modicon m241 firmwareversion to verify

Branch	Affected	Fixed in	Source
4.0	≤ 4.0.3.20	no fix published	NVD

Schneider-electric modicon m251 firmwareversion to verify

Branch	Affected	Fixed in	Source
4.0	≤ 4.0.3.20	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-17-089-02 CISA5 known affected
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 · Modicon M251: all versions · +2 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsSchneider Electric has released new firmware versions to address the predictable value range from previous values vulnerability and the use of insufficiently random values vulnerability, which are available through Schneider Electric's software update tool, SoMachine, Version 4.2, and SoMachineBasi…
Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsSoMachineBasic, Version 1.5, is available
Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsVerify that the hardware and software infrastructure that the PLCs are integrated into (along with all organizational measures and rules covering access to the infrastructure) consider the results of the hazard and risk analysis, and are implemented according to best practices and standards such as…
Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsLimit traffic on the local network with managed switches
Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsWhere possible, avoid using Wi-Fi networks, but when Wi-Fi is essential, use only secure communications (such as WPA2 encryption)
Mitigation from the vendor CISA ICSA-17-089-02 · 5 productsDo not grant [network] access to unknown computers

Detection

Nuclei template: none so far
Exploit-DB: EDB-45918
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-330read 2026-10-23
NVDweakness (CWE)CWE-330read 2026-10-23
FIRST EPSSEPSS score31.8 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2017-06-30
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-6026?

Is CVE-2017-6026 actively exploited?

Active exploitation of CVE-2017-6026 has not been confirmed. Its EPSS score was 31.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-6026?

CVE-2017-6026 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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