What is CVE-2021-4457?

CVE-2021-4457 is a critical-severity vulnerability in Digitalzoomstudio Zoomsounds, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2025-06-25.

How severe is CVE-2021-4457?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Arbitrary file upload in Digitalzoomstudio Zoomsounds

CVE-2021-4457

The ZoomSounds plugin before 6.05 contains a PHP file allowing unauthenticated users to upload an arbitrary file anywhere on the web server.

Vulnerability class: Unrestricted File Upload

Published 2025-06-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001

Affected products

Digitalzoomstudio Zoomsounds
Zoomsounds — versions 0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

wpscan.com/vulnerability/07259a61-8ba9-4dd0-8d52-cc1df389c0ad (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2021-4457?: CVE-2021-4457 is a critical-severity vulnerability in Digitalzoomstudio Zoomsounds, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2025-06-25.
How severe is CVE-2021-4457?: Critical severity. CVSS v3 base score is 9.1 out of 10.