Silabs Zigbee up to 4.3.3/2024.6.1 CPCd locking

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Silabs Zigbee up to 4.3.3/2024.6.1. This vulnerability affects unknown code of the component CPCd. The manipulation results in locking. This vulnerability was named CVE-2025-1221. The attack needs to be approached within the local network. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in Silabs Zigbee up to 4.3.3/2024.6.1. Affected is an unknown code block of the component CPCd. The manipulation with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on availability. CVE summarizes:

A Zigbee Radio Co-Processor (RCP), which is using SiLabs EmberZNet Zigbee stack, was unable to send messages to the host system (CPCd) due to heavy Zigbee traffic, resulting in a Denial of Service (DoS) attack, Only hard reset will bring the device to normal operation

The advisory is shared for download at silabs.com. This vulnerability is traded as CVE-2025-1221 since 02/11/2025. The exploitability is told to be easy. Access to the local network is required for this attack. There are neither technical details nor an exploit publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 5.7
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/11/2025 🔍
07/30/2025 +168 days 🔍
07/30/2025 +0 days 🔍
07/30/2025 +0 days 🔍

Sourcesinfo

Advisory: silabs.com
Status: Confirmed

CVE: CVE-2025-1221 (🔍)
GCVE (CVE): GCVE-0-2025-1221
GCVE (VulDB): GCVE-100-318288

Entryinfo

Created: 07/30/2025 10:36
Updated: 07/30/2025 15:23
Changes: 07/30/2025 10:36 (64), 07/30/2025 15:23 (1)
Complete: 🔍
Cache ID: 216::103

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