CVE-2021-33828

FAUCET Score

CVE-2021-33828 describes a critical vulnerability in the ownCloud files_antivirus component prior to version 1.0.0, where malicious files uploaded to public shares are not properly deleted after detection. This flaw carries a high CVSS score of 8.8, indicating that an authenticated attacker can remotely achieve high confidentiality, integrity, and availability impacts with low attack complexity. While no active exploitation, public exploit code, or significant community discussion has been observed, the vulnerability's nature and high severity warrant attention.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 1.0.0CPE matchmatch criteria	cpe:2.3:a:owncloud:files_antivirus::::::::

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

2.8

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.16%

Probability of exploitation in next 30 days

EPSS Percentile

63.7%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0116 is in the 61st percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

doc.owncloud.com / server/admin_manual/release_notes.html

Release NotesVendor Advisory

owncloud.com / security-advisories/cve-2021-33828

Vendor Advisory