Unauthorized information access via predictable session identifiers
Published May 12, 2026 · Updated May 12, 2026
Insufficient session randomness in Siemens SIPROTEC 5 devices allows remote attackers to read limited web-server information. The embedded web server generates session identifiers from an insufficiently random value space, making valid identifiers susceptible to brute-force guessing. No authentication or user interaction is required, but access is limited to information exposed by the subset of endpoints using the affected identifiers.
Summary
What happened
Insufficient session randomness in Siemens SIPROTEC 5 devices allows remote attackers to read limited web-server information. The embedded web server generates session identifiers from an insufficiently random value space, making valid identifiers susceptible to brute-force guessing. No authentication or user interaction is required, but access is limited to information exposed by the subset of endpoints using the affected identifiers.
The record
- CVE
- CVE-2024-54017
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIPROTEC 5 6MD86 (CP300)
- Classifications
- CWE-334, T1550.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=V7.80 <V11.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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