---
id: CVE-2026-62647
title: A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70)
summary: >-
  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
  wi…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-20
vendor: Siemens
product: Reyrolle 7SR5
affected:
  - reyrolle_7sr5 < V2.70
published: '2026-09-08'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T14:17:08.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62647'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-142885.html'
    label: productcert@siemens.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-14T13:46:37.396990Z'
epss: 0.00563
epssPercentile: 0.44461
ingestedAt: '2026-09-08T15:33:26.982Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.