CVE-2026-6923: CWE-1300 Improper protection of physical side channels in Nuvoton NPCT7xx
CVE-2026-6923 is a vulnerability in Nuvoton NPCT7xx TPM devices that allows a physical side-channel attack to extract an Elliptic Curve Diffie-Hellman (ECDH) key. Exploitation requires physical presence and high privileges, with high attack complexity. The vulnerability affects all versions below 7. 2. 4. 0. No official patch or remediation guidance is currently available from the vendor. The CVSS score is 3. 8, indicating low severity due to the attack conditions and limited impact scope.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-6923) involves improper protection of physical side channels (CWE-1300) in Nuvoton NPCT7xx TPM devices. An attacker with physical access and high privileges can perform a side-channel attack to extract an ECDH key. The vulnerability affects all versions below 7.2.4.0. The CVSS vector indicates a physical attack vector (AV:P), high attack complexity (AC:H), and requires high privileges (PR:H). No integrity or availability impact is noted, but confidentiality is high due to key extraction.
Potential Impact
Successful exploitation leads to disclosure of an ECDH key, compromising confidentiality of cryptographic operations relying on that key. However, the attack requires physical presence and high privileges, limiting the practical risk. There is no impact on integrity or availability. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, physical access to affected devices should be strictly controlled to mitigate risk. No vendor advisory or patch links are currently provided.
CVE-2026-6923: CWE-1300 Improper protection of physical side channels in Nuvoton NPCT7xx
Description
CVE-2026-6923 is a vulnerability in Nuvoton NPCT7xx TPM devices that allows a physical side-channel attack to extract an Elliptic Curve Diffie-Hellman (ECDH) key. Exploitation requires physical presence and high privileges, with high attack complexity. The vulnerability affects all versions below 7. 2. 4. 0. No official patch or remediation guidance is currently available from the vendor. The CVSS score is 3. 8, indicating low severity due to the attack conditions and limited impact scope.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-6923) involves improper protection of physical side channels (CWE-1300) in Nuvoton NPCT7xx TPM devices. An attacker with physical access and high privileges can perform a side-channel attack to extract an ECDH key. The vulnerability affects all versions below 7.2.4.0. The CVSS vector indicates a physical attack vector (AV:P), high attack complexity (AC:H), and requires high privileges (PR:H). No integrity or availability impact is noted, but confidentiality is high due to key extraction.
Potential Impact
Successful exploitation leads to disclosure of an ECDH key, compromising confidentiality of cryptographic operations relying on that key. However, the attack requires physical presence and high privileges, limiting the practical risk. There is no impact on integrity or availability. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, physical access to affected devices should be strictly controlled to mitigate risk. No vendor advisory or patch links are currently provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- INCD
- Date Reserved
- 2026-04-23T16:23:24.316Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a05fda1ec166c07b0f931e6
Added to database: 5/14/2026, 4:51:45 PM
Last enriched: 5/14/2026, 5:07:51 PM
Last updated: 5/14/2026, 5:55:00 PM
Views: 2
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