VDB-373855 · CVE-2026-2815 · GCVE-0-2026-2815

Silicon Labs SiSDK up to 2025.12.1 EFR32xG27 Result prng seed

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.1	$0-$5k	1.25-

Summaryinfo

A vulnerability classified as problematic has been found in Silicon Labs SiSDK up to 2025.12.1. This impacts an unknown function of the component EFR32xG27 Result Handler. This manipulation causes prng seed. This vulnerability is registered as CVE-2026-2815. The attack requires access to the local network. No exploit is available.

Detailsinfo

A vulnerability has been found in Silicon Labs SiSDK up to 2025.12.1 and classified as problematic. Affected by this vulnerability is some unknown processing of the component EFR32xG27 Result Handler. The manipulation with an unknown input leads to a prng seed vulnerability. The CWE definition for the vulnerability is CWE-339. A Pseudo-Random Number Generator (PRNG) uses a relatively small seed space, which makes it more susceptible to brute force attacks. As an impact it is known to affect confidentiality. The summary by CVE is:

Incorrect use of the PUF key for user key generation in EFR32xG27 results in predictable keys

It is possible to read the advisory at siliconlabs.lightning.force.com. This vulnerability is known as CVE-2026-2815 since 02/19/2026. The exploitation appears to be difficult. Access to the local network is required for this attack to succeed. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1600.001 according to MITRE ATT&CK.

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

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Silicon Labs

Name

SiSDK

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: 3.1
VulDB Meta Temp Score: 3.1

VulDB Base Score: 3.1
VulDB Temp Score: 3.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Prng seed
CWE: CWE-339 / CWE-331 / CWE-330
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/19/2026 CVE reserved
06/25/2026 +125 days Advisory disclosed
06/25/2026 +0 days VulDB entry created
06/25/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: siliconlabs.lightning.force.com
Status: Not defined

CVE: CVE-2026-2815 (🔒)
GCVE (CVE): GCVE-0-2026-2815
GCVE (VulDB): GCVE-100-373855

Entryinfo

Created: 06/25/2026 16:42
Changes: 06/25/2026 16:42 (64)
Complete: 🔍
Cache ID: 216::103