CVE-2026-4827: CWE-331 Insufficient entropy in Schneider Electric Easergy MiCOM C264
We strongly recommend the following industry cybersecurity best practices. * Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network. * Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks. * Place all controllers in locked cabinets and never leave them in the “Program” mode. * Never connect programming software to any network other than the network intended for that device. * Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks. * Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation. * Minimize network exposure for all control system devices and systems and ensure that they are not accessible from the Internet. * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices. For more information refer to the Schneider Electric [Recommended Cybersecurity Best Practices](https://www.se.com/us/en/download/document/7EN52-0390/) document.
AI Analysis
Technical Summary
This vulnerability, classified as CWE-331 (Insufficient Entropy), exists in Schneider Electric Easergy MiCOM C264 devices. It involves weak randomness in session management mechanisms, which could be exploited by a network attacker to bypass protections and gain unauthorized access. The CVSS 4.0 base score is 8.7, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction needed, and high impact on confidentiality and integrity. The affected versions are all versions up to 7.33 inclusive. No official fix or remediation level has been published by Schneider Electric as of the publication date.
Potential Impact
An attacker on the network could exploit the insufficient entropy in session management to bypass protections and gain unauthorized access to the affected device. This could lead to compromise of confidentiality and integrity of the system. The vulnerability does not require privileges or authentication but does require user interaction. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level has been published, users should monitor Schneider Electric advisories for updates. Until a patch is available, consider limiting network exposure of affected devices and applying compensating controls as appropriate.
CVE-2026-4827: CWE-331 Insufficient entropy in Schneider Electric Easergy MiCOM C264
Description
We strongly recommend the following industry cybersecurity best practices. * Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network. * Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks. * Place all controllers in locked cabinets and never leave them in the “Program” mode. * Never connect programming software to any network other than the network intended for that device. * Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks. * Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation. * Minimize network exposure for all control system devices and systems and ensure that they are not accessible from the Internet. * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices. For more information refer to the Schneider Electric [Recommended Cybersecurity Best Practices](https://www.se.com/us/en/download/document/7EN52-0390/) document.
CVSS v4.0
Score 8.7high
Affected software
pkg:github/schneiderelectric/EasergyMiCOMC264Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, classified as CWE-331 (Insufficient Entropy), exists in Schneider Electric Easergy MiCOM C264 devices. It involves weak randomness in session management mechanisms, which could be exploited by a network attacker to bypass protections and gain unauthorized access. The CVSS 4.0 base score is 8.7, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction needed, and high impact on confidentiality and integrity. The affected versions are all versions up to 7.33 inclusive. No official fix or remediation level has been published by Schneider Electric as of the publication date.
Potential Impact
An attacker on the network could exploit the insufficient entropy in session management to bypass protections and gain unauthorized access to the affected device. This could lead to compromise of confidentiality and integrity of the system. The vulnerability does not require privileges or authentication but does require user interaction. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level has been published, users should monitor Schneider Electric advisories for updates. Until a patch is available, consider limiting network exposure of affected devices and applying compensating controls as appropriate.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- schneider
- Date Reserved
- 2026-03-25T14:07:29.111Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a031edecbff5d8610deb8aa
Added to database: 05/12/2026, 12:36:46 UTC
Last enriched: 06/19/2026, 19:24:02 UTC
Last updated: 09/10/2026, 19:36:54 UTC
Views: 114
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.