Is CVE-2021-38366 actively exploited?

No active exploitation of CVE-2021-38366 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-38366 be exploited remotely?

Yes. CVE-2021-38366 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-38366?

CVE-2021-38366 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2021-38366

HIGH

CVE-2021-38366

CWE-434Published: August 12, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

Sitecore through 10.1, when Update Center is enabled, allows remote authenticated users to upload arbitrary files and achieve remote code execution by visiting an uploaded .aspx file at an admin/Packages URL.

NVD Source

Technical Analysis

CVE-2021-38366 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.