CVE-2023-51393Network attack vector

Device crash via unbounded resource allocation

Published Feb 23, 2024 · Updated Apr 22, 2025

Uncontrolled resource consumption in Silicon Labs EmberZNet SDK before 7.4.0.0 allows remote attackers to crash an embedded device. The public CNA record states that unbounded resource allocation triggers a bus fault, but Silicon Labs has not disclosed the responsible code path, function, or allocated resource. No privileges or user interaction are required; the device must be rebooted before it can rejoin the Zigbee network.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Silicon Labs EmberZNet SDK before 7.4.0.0 allows remote attackers to crash an embedded device. The public CNA record states that unbounded resource allocation triggers a bus fault, but Silicon Labs has not disclosed the responsible code path, function, or allocated resource. No privileges or user interaction are required; the device must be rebooted before it can rejoin the Zigbee network.

The record

CVE
CVE-2023-51393
Published
Feb 23, 2024
Updated
Apr 22, 2025
Vendor
Silicon Laboratories
Product
Zigbee EmberZNet SDK
Classifications
CWE-770, T1499
Attack vector
network
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=0 <7.4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Silicon Laboratories · Zigbee EmberZNet SDKversion=0 <7.4.0.0

Published CVSS scores

5.3Silicon LabsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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