How severe is CVE-2025-3873?

CVE-2025-3873 has a CVSS 4.0 base score of 6.0, rated medium severity.

Is CVE-2025-3873 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-3873?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-3873 have an EU (EUVD) identifier?

Yes. CVE-2025-3873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22724.

When was CVE-2025-3873 published?

CVE-2025-3873 was published on 2025-07-25 and last updated on 2026-06-17.

CVE-2025-3873

CVE-2025-3873 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. 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-787.

Key facts

Severity: Medium (CVSS 4.0 base score 6.0)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22724
Weakness: CWE-787
Published: 2025-07-25
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-3873?: 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
How severe is CVE-2025-3873?: CVE-2025-3873 has a CVSS 4.0 base score of 6.0, rated medium severity.
Is CVE-2025-3873 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-3873?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3873 have an EU (EUVD) identifier?: Yes. CVE-2025-3873 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22724.
When was CVE-2025-3873 published?: CVE-2025-3873 was published on 2025-07-25 and last updated on 2026-06-17.

References

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