CVE-2023-4020: Unvalidated input in Silicon Labs PSA Attestation service leads to secure memory access from non-secure memory

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-15 · updated 2026-06-17
Weakness: CWE-125

Description

An unvalidated input in a library function responsible for communicating between secure and non-secure memory in Silicon Labs TrustZone implementation allows reading/writing of memory in the secure region of memory from the non-secure region of memory.

Affected products

silabs.com Gecko Platform: from 1.0.0 before 4.4.0 — fixed in 4.4.0

How to fix

Upgrade to a fixed version: silabs.com Gecko Platform 4.4.0. Check the vendor advisory for mitigations.

References

https://community.silabs.com/069Vm0000004b95IAA
https://github.com/SiliconLabs/gecko_sdk/releases
https://community.silabs.com/069Vm0000004b95IAA
https://github.com/SiliconLabs/gecko_sdk/releases

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