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

CVE-2017-6026 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 18.6%.

Is there a public PoC exploit available for CVE-2017-6026?

Yes, a public proof-of-concept exploit is available for CVE-2017-6026. Prioritise patching immediately. EPSS: 18.6%.

Modicon M251 Firmware CVE-2017-6026

CRITICAL

Use of Insufficiently Random Values (CWE-330)

2017-06-30 ics-cert@hq.dhs.gov

Schneider Electric Information Disclosure Modicon M251 Firmware Modicon M241 Firmware

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

CVE Published

Jun 30, 2017 - 03:29 cve.org

CRITICAL 9.1

DescriptionCVE.org

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.

AnalysisAI

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. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 18.6%.

Technical ContextAI

This vulnerability is classified under CWE-330. 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 products include: Schneider-Electric Modicon M251 Firmware, Schneider-Electric Modicon M241 Firmware. Version information: Version 4.0.5.11.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.