CVE-2025-2329

RCP reset via uncleared SPI transmit buffer

Published Jul 25, 2025 · Updated Aug 4, 2025

Denial of service in affected Silicon Labs OpenThread SDK releases allows adjacent attackers to reset an RCP through high traffic. The RCP fails to clear its SPI transmit buffer and sends a corrupt packet to the host, which responds by resetting the co-processor. Exploitation requires adjacent access sufficient to create high Thread traffic against an SPI-connected RCP, and the documented consequence is a temporary service interruption rather than data exposure or modification.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Silicon Labs OpenThread SDK releases allows adjacent attackers to reset an RCP through high traffic. The RCP fails to clear its SPI transmit buffer and sends a corrupt packet to the host, which responds by resetting the co-processor. Exploitation requires adjacent access sufficient to create high Thread traffic against an SPI-connected RCP, and the documented consequence is a temporary service interruption rather than data exposure or modification.

The record

CVE
CVE-2025-2329
Published
Jul 25, 2025
Updated
Aug 4, 2025
Vendor
Sigma Designs
Product
Silicon Labs OpenThread SDK
Classifications
CWE-908, CAPEC-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 <=2.4.6
  2. Affected versionversion=2.5.0 <=2.5.2
  3. Affected versionversion=2.6.0 <=2.6.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Sigma Designs · Silicon Labs OpenThread SDKversion=0 <=2.4.6; version=2.5.0 <=2.5.2; version=2.6.0 <=2.6.2

Published CVSS scores

5.3Silicon LabsCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
CAPEC-125Flooding
T1499.004Application or System Exploitation

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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