CVE-2026-62647 Siemens CVE debrief

Who should care

Defenders responsible for Reyrolle 7SR5 devices, security teams, and network administrators should prioritize inventory checks, remediation, and compensating controls to mitigate the risk. They should also verify the authenticity of users and sessions, and implement compensating controls to monitor and restrict access to the devices. Additionally, they should review and update security configurations to prevent unauthorized access, conduct regular security

Why it matters

CVE-2026-62647 is a critical vulnerability in Reyrolle 7SR5 devices that could allow unauthenticated remote access. Defenders should prioritize inventory checks, remediation, and compensating controls to mitigate the risk.

• Potential unauthorized access to the device
• Need for verification of user and session authenticity
• Possible impersonation of legitimate authenticated users

Technical summary

The Reyrolle 7SR5 device uses a random number generator that is not initialized with a True Random Number Generator (TRNG), resulting in predictable generated values. This could allow an unauthenticated remote attacker to impersonate a legitimate authenticated user, potentially gaining unauthorized access to the device. The vulnerability affects devices with versions prior to V2.70 and could enable attackers to predict generated security-relevant values, leading to unauthorized access and potential disruptions to device operations.

Defensive priority

High priority for inventory checks and remediation

Recommended defensive actions

• Inventory Reyrolle 7SR5 devices and check for version V2.70 or later
• Implement compensating controls to monitor and restrict access to the devices
• Verify the authenticity of users and sessions
• Review and update security configurations to prevent unauthorized access
• Conduct regular security audits to identify potential vulnerabilities
• Monitor device logs for suspicious activity
• Develop an incident response plan in case of a security breach

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but information on affected versions and remediation is limited. The Reyrolle 7SR5 device uses a random number generator that is not initialized with a True Random Number Generator (TRNG), resulting in predictable generated values. Defenders should verify the authenticity of users and sessions, and implement compensating controls to monitor and restrict access to the devices.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.