How severe is CVE-2023-4020?

CVE-2023-4020 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2023-4020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4020?

CVE-2023-4020 affects Silabs Gecko Software Development Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-4020?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-4020 published?

CVE-2023-4020 was published on 2023-12-15 and last updated on 2026-06-17.

CVE-2023-4020

CVE-2023-4020 is a critical-severity vulnerability in Silabs Gecko Software Development Kit with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Silabs Gecko Software Development Kit
Published: 2023-12-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-4020?: 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.
How severe is CVE-2023-4020?: CVE-2023-4020 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2023-4020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4020?: CVE-2023-4020 affects Silabs Gecko Software Development Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-4020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-4020 published?: CVE-2023-4020 was published on 2023-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:silabs:gecko_software_development_kit:*:*:*:*:*:*:*:*

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