Authenticated information disclosure via predictable PRNG seed
Published Aug 12, 2025 · Updated Aug 12, 2025
Predictable PRNG seeding in Intel TDX Module before 1.5.16 or 2.0.8 allows local users with authenticated access to disclose information. The firmware initializes its pseudorandom number generator from a predictable seed, allowing generated values to be inferred rather than remain secret. Exploitation requires low-privileged local access and a deployment condition reflected by Intel's attack-requirements metric; published impacts are limited to confidentiality.
Summary
What happened
Predictable PRNG seeding in Intel TDX Module before 1.5.16 or 2.0.8 allows local users with authenticated access to disclose information. The firmware initializes its pseudorandom number generator from a predictable seed, allowing generated values to be inferred rather than remain secret. Exploitation requires low-privileged local access and a deployment condition reflected by Intel's attack-requirements metric; published impacts are limited to confidentiality.
The record
- CVE
- CVE-2025-20613
- Published
- Aug 12, 2025
- Updated
- Aug 12, 2025
- Vendor
- Topcon Positioning Systems, Inc.
- Product
- Intel TDX Module
- Classifications
- CWE-337
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 12, 2025CVE publishedPublication date reported by the CVE source.
- Aug 12, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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