Description
A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A random number generator is used to generate security-relevant values (such as session identifiers used for authentication purposes) that is not initialized with a True Random Number Generator (TRNG), resulting in a predictable sequence of generated values. This could allow an unauthenticated remote attacker to more easily predict the generated values and impersonate a legitimate authenticated user, potentially gaining unauthorized access to the device.
Published: 2026-09-08
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 08 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
Title Predictable Session Identifier Generation in Siemens Reyrolle 7SR5 Enables Authentication Impersonation

Tue, 08 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A random number generator is used to generate security-relevant values (such as session identifiers used for authentication purposes) that is not initialized with a True Random Number Generator (TRNG), resulting in a predictable sequence of generated values. This could allow an unauthenticated remote attacker to more easily predict the generated values and impersonate a legitimate authenticated user, potentially gaining unauthorized access to the device.
Weaknesses CWE-20
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2026-09-08T08:11:24.801Z

Reserved: 2026-07-14T16:24:23.430Z

Link: CVE-2026-62647

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-08T09:18:16.840

Modified: 2026-09-08T09:18:16.840

Link: CVE-2026-62647

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T09:30:07Z

Weaknesses
  • CWE-20

    Improper Input Validation