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.

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History

Mon, 14 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Siemens
Siemens reyrolle 7sr5
Vendors & Products Siemens
Siemens reyrolle 7sr5

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2026-09-14T13:50:49.615Z

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

Link: CVE-2026-62647

cve-icon Vulnrichment

Updated: 2026-09-14T13:48:01.016Z

cve-icon NVD

Status : Deferred

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

Modified: 2026-09-14T14:17:08.007

Link: CVE-2026-62647

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T20:35:36Z

Weaknesses