What is CVE-2023-21531?

CVE-2023-21531 is a high-severity vulnerability in Microsoft Azure Service Fabric, classified under Improper Access Control. CVSS score: 7.0/10. Published 2023-01-10.

How severe is CVE-2023-21531?

High severity. CVSS v3 base score is 7.0 out of 10.

Privilege escalation in Microsoft Azure Service Fabric

CVE-2023-21531

Azure Service Fabric Container Elevation of Privilege Vulnerability

Published 2023-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Microsoft Azure Service Fabric — versions 8.2, 9.0, 9.1
Microsoft Azure Service Fabric 8.2 — versions 8.2
Microsoft Azure Service Fabric 9.0 For Linux — versions 9.0
Microsoft Azure Service Fabric 9.1 — versions 9.1

Weakness classification (CWE)

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21531 (vendor-advisory)

Frequently asked questions

What is CVE-2023-21531?: CVE-2023-21531 is a high-severity vulnerability in Microsoft Azure Service Fabric, classified under Improper Access Control. CVSS score: 7.0/10. Published 2023-01-10.
How severe is CVE-2023-21531?: High severity. CVSS v3 base score is 7.0 out of 10.