CVE-2023-51392

Key disclosure via software AES-CCM side channels

Published Feb 23, 2024 · Updated Apr 22, 2025

Side-channel exposure in Silicon Labs Zigbee EmberZNet SDK 7.2.0 through 7.3.3 allows physically proximate attackers to recover keys. The cryptographic path for EFR32xxx parts using classic key storage performs AES-CCM in software instead of invoking integrated hardware cryptographic accelerators. Exploitation requires proximal access and electromagnetic or differential-power measurement equipment; successful analysis discloses processed secrets without changing device operation.

CVSS severity6.2
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Side-channel exposure in Silicon Labs Zigbee EmberZNet SDK 7.2.0 through 7.3.3 allows physically proximate attackers to recover keys. The cryptographic path for EFR32xxx parts using classic key storage performs AES-CCM in software instead of invoking integrated hardware cryptographic accelerators. Exploitation requires proximal access and electromagnetic or differential-power measurement equipment; successful analysis discloses processed secrets without changing device operation.

The record

CVE
CVE-2023-51392
Published
Feb 23, 2024
Updated
Apr 22, 2025
Vendor
Silicon Laboratories
Product
Zigbee EmberZNet SDK
Classifications
CWE-1240, CWE-327, CAPEC-622
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.2.0 <7.4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Silicon Laboratories · Zigbee EmberZNet SDKversion=7.2.0 <7.4.0

Published CVSS scores

6.2Silicon LabsCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1240Use of a Cryptographic Primitive with a Risky Implementation
CWE-327Use of a Broken or Risky Cryptographic Algorithm
CAPEC-622Electromagnetic Side-Channel Attack

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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