THREATPORT/VULNERABILITY/CVE-2017-6026
CRITICAL SEVERITY

CVE-2017-6026

Modicon M251 Firmware vulnerability

CVSS
9.1
EPSS
31.8%
EPSS pct
98th
Exploited
No known
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.
Affected vendor
Schneider Electric
Affected product
Modicon M251 Firmware
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness type (CWE)
  • CWE-330 — Use of Insufficiently Random Values
Published
2017-06-30

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 31.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2017-6026

  • Confirm whether Schneider Electric Modicon M251 Firmware is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-6026.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-6026

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-6026 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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