What is CVE-2021-33827?

CVE-2021-33827 is a high-severity vulnerability in ownCloud Files Antivirus, classified under OS Command Injection. CVSS score: 7.2/10. Published 2022-01-15.

How severe is CVE-2021-33827?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in ownCloud Files Antivirus

CVE-2021-33827

The files_antivirus component before 1.0.0 for ownCloud allows OS Command Injection via the administration settings.

Vulnerability class: Command Injection (OS Command Injection)

Published 2022-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

ownCloud Files Antivirus

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

doc.owncloud.com/server/admin_manual/release_notes.html (Release Notes, Vendor Advisory)
owncloud.com/security-advisories/cve-2021-33827/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33827?: CVE-2021-33827 is a high-severity vulnerability in ownCloud Files Antivirus, classified under OS Command Injection. CVSS score: 7.2/10. Published 2022-01-15.
How severe is CVE-2021-33827?: High severity. CVSS v3 base score is 7.2 out of 10.