How severe is CVE-2023-38163?

CVE-2023-38163 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-38163 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-38163?

CVE-2023-38163 affects Microsoft Windows Defender Security Intelligence Updates. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-38163?

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

When was CVE-2023-38163 published?

CVE-2023-38163 was published on 2023-09-12 and last updated on 2026-06-17.

CVE-2023-38163

CVE-2023-38163 is a high-severity vulnerability in Microsoft Windows Defender Security Intelligence Updates with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Defender Security Intelligence Updates
Published: 2023-09-12
Last modified: 2026-06-17

Description

Windows Defender Attack Surface Reduction Security Feature Bypass

Frequently asked questions

What is CVE-2023-38163?: Windows Defender Attack Surface Reduction Security Feature Bypass
How severe is CVE-2023-38163?: CVE-2023-38163 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-38163 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-38163?: CVE-2023-38163 affects Microsoft Windows Defender Security Intelligence Updates. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-38163?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-38163 published?: CVE-2023-38163 was published on 2023-09-12 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38163

Affected products (1)

cpe:2.3:a:microsoft:windows_defender_security_intelligence_updates:*:*:*:*:*:*:*:*