CVE-2025-3301

Key disclosure via unprotected cryptographic power traces

Published Apr 29, 2025 · Updated Apr 29, 2025

Power side-channel exposure in Silicon Labs Series 2 SoCs and modules allows physically proximate attackers to recover confidential keys. The Hardware Secure Engine lacks DPA countermeasures during Curve25519 and Curve448 ECDH and Curve25519 EdDSA signing, leaving secret-dependent power traces exposed. Exploitation requires an affected algorithm, physical access, specialized equipment, many traces, and some control of device operation; successful analysis exposes private keys or encrypted communications.

CVSS severity1.0
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Power side-channel exposure in Silicon Labs Series 2 SoCs and modules allows physically proximate attackers to recover confidential keys. The Hardware Secure Engine lacks DPA countermeasures during Curve25519 and Curve448 ECDH and Curve25519 EdDSA signing, leaving secret-dependent power traces exposed. Exploitation requires an affected algorithm, physical access, specialized equipment, many traces, and some control of device operation; successful analysis exposes private keys or encrypted communications.

The record

CVE
CVE-2025-3301
Published
Apr 29, 2025
Updated
Apr 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1255, CAPEC-189
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

1.0Silicon LabsCVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1255Comparison Logic is Vulnerable to Power Side-Channel Attacks
CAPEC-189Black Box Reverse Engineering

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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