What is CVE-2023-21778?

CVE-2023-21778 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Command Injection. CVSS score: 8.0/10. Published 2023-02-14.

How severe is CVE-2023-21778?

High severity. CVSS v3 base score is 8.0 out of 10.

RCE in Microsoft Dynamics 365

CVE-2023-21778

Microsoft Dynamics Unified Service Desk Remote Code Execution Vulnerability

Vulnerability class: Command Injection (OS Command Injection)

Published 2023-02-14 · last modified 2026-08-19.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.5th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Microsoft Dynamics 365
Microsoft Dynamics 365 Unified Service Desk — versions 4.2.0

Weakness classification (CWE)

CWE-77 — Command Injection

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21778 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-21778?: CVE-2023-21778 is a high-severity vulnerability in Microsoft Dynamics 365, classified under Command Injection. CVSS score: 8.0/10. Published 2023-02-14.
How severe is CVE-2023-21778?: High severity. CVSS v3 base score is 8.0 out of 10.