How severe is CVE-2021-33827?

CVE-2021-33827 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33827 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33827?

CVE-2021-33827 affects Owncloud Files Antivirus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33827?

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-2021-33827 published?

CVE-2021-33827 was published on 2022-01-15 and last updated on 2026-06-17.

CVE-2021-33827

CVE-2021-33827 is a high-severity vulnerability in Owncloud Files Antivirus with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Owncloud Files Antivirus
Published: 2022-01-15
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-33827?: The files_antivirus component before 1.0.0 for ownCloud allows OS Command Injection via the administration settings.
How severe is CVE-2021-33827?: CVE-2021-33827 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33827 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33827?: CVE-2021-33827 affects Owncloud Files Antivirus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33827?: 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-2021-33827 published?: CVE-2021-33827 was published on 2022-01-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:owncloud:files_antivirus:*:*:*:*:*:*:*:*

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