ECDH key extraction via physical side channel
Published May 14, 2026 · Updated May 14, 2026
Physical side-channel exposure in Nuvoton NPCT7xx firmware before 7.2.4.0 allows physically proximate attackers to extract ECDH keys. Nuvoton identifies the affected component as Elliptic Curve Diffie-Hellman keys but has not published the measured signal or vulnerable cryptographic operation. Exploitation requires physical presence at the TPM, high privileges, and high attack complexity; the reported consequence is key disclosure only.
Summary
What happened
Physical side-channel exposure in Nuvoton NPCT7xx firmware before 7.2.4.0 allows physically proximate attackers to extract ECDH keys. Nuvoton identifies the affected component as Elliptic Curve Diffie-Hellman keys but has not published the measured signal or vulnerable cryptographic operation. Exploitation requires physical presence at the TPM, high privileges, and high attack complexity; the reported consequence is key disclosure only.
The record
- CVE
- CVE-2026-6923
- Published
- May 14, 2026
- Updated
- May 14, 2026
- Vendor
- Nuvoton Technology Corporation
- Product
- NPCT7xx
- Classifications
- CWE-1300
- Attack vector
- physical
- Privileges
- admin
Timeline
How it unfolded
- May 14, 2026CVE publishedPublication date reported by the CVE source.
- May 14, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=all versions below 7.2.4.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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