Vulnerability · Published Jun 25, 2026 · Assigned by Silabs
CVE-2026-2815Incorrect use of the PUF key for user key generation in EFR32xG27 results in predictable keys
High 8.4
In plain English
A high-severity security flaw in SiSDK from Silicon Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 4.0)8.4High
Exploit odds (30 days)0.3%top 83.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Incorrect use of the PUF key for user key generation in EFR32xG27 results in predictable keys
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Silicon Labs | SiSDK | 0 – through 2025.12.1 |
Weakness: CWE-339 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N
References
- https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000kDYsfIAG?operationContext=S1 vendor-advisory, permissions-required
- https://github.com/SiliconLabsSoftware/sisdk-release patch