Silabs WiseConnect up to 3.3.x API sl_si91x_aes out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability has been found in Silabs WiseConnect up to 3.3.x and classified as critical. This issue affects the function sl_si91x_aes of the component API. This manipulation causes out-of-bounds write. This vulnerability is handled as CVE-2025-3873. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Silabs WiseConnect up to 3.3.x. It has been declared as critical. Affected by this vulnerability is the function sl_si91x_aes of the component API. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The following APIs for the Silcon Labs SiWx91x prior to vesion 3.4.0 failed to check the size of the output buffer of the caller which could lead to data corruption on the host (Cortex-M4) application. sl_si91x_aes sl_si91x_gcm sl_si91x_ccm sl_si91x_sha

The advisory is shared at docs.silabs.com. This vulnerability is known as CVE-2025-3873 since 04/22/2025. The exploitation appears to be difficult. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 3.4.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: WiseConnect 3.4.0

Timelineinfo

04/22/2025 CVE reserved
07/25/2025 +94 days Advisory disclosed
07/25/2025 +0 days VulDB entry created
07/30/2025 +5 days VulDB entry last update

Sourcesinfo

Advisory: docs.silabs.com
Status: Confirmed

CVE: CVE-2025-3873 (🔒)
GCVE (CVE): GCVE-0-2025-3873
GCVE (VulDB): GCVE-100-317761

Entryinfo

Created: 07/25/2025 19:35
Updated: 07/30/2025 04:17
Changes: 07/25/2025 19:35 (68), 07/30/2025 04:17 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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