CVE-2026-62646: CWE-331: Insufficient Entropy in Siemens Reyrolle 7SR5
Description
A vulnerability has been identified in Reyrolle 7SR5 (All versions < V2.70). A session identifier is generated using an algorithm with insufficient randomness, resulting in a token with low entropy that can be predicted or brute-forced within a feasible number of attempts. This could allow an unauthenticated remote attacker to derive valid session identifiers and bypass authentication.
CVSS v3.1
Score 7.4high
Affected software
Siemens
Reyrolle 7SR5
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-62646 affects Siemens Reyrolle 7SR5 versions earlier than 2.70. It stems from the use of an insufficiently random algorithm to generate session identifiers, leading to tokens with low entropy. An attacker can exploit this by predicting or brute-forcing session tokens, thereby bypassing authentication mechanisms without needing prior credentials. The CVSS v3.1 base score is 7.4, indicating a high severity with network attack vector, high attack complexity, no privileges required, no user interaction, and high impact on confidentiality and integrity but no impact on availability.
Potential Impact
An unauthenticated remote attacker can derive valid session identifiers due to insufficient entropy in token generation. This enables bypassing authentication, potentially leading to unauthorized access to the affected system's functions or data. The confidentiality and integrity of the system are at high risk, while availability is not impacted.
Mitigation Recommendations
No official patch or remediation details are provided in the available data. Patch status is not yet confirmed — check the Siemens vendor advisory for current remediation guidance. Until a fix is available, consider restricting network access to the affected device and monitoring for unauthorized access attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- siemens
- Date Reserved
- 2026-07-14T16:24:23.430Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9fc954acd9273b49571d8c
Added to database: 09/08/2026, 08:37:40 UTC
Last enriched: 09/16/2026, 01:36:48 UTC
Last updated: 10/23/2026, 15:12:06 UTC
Views: 70
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