Is CVE-2021-4457 actively exploited?

No active exploitation of CVE-2021-4457 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-4457 be exploited remotely?

Yes. CVE-2021-4457 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-4457?

CVE-2021-4457 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2021-4457

CWE-434Published: June 25, 2025· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

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

NVD Source

Risk Analysis

The ZoomSounds plugin before version 6.05 allows unauthenticated users to upload arbitrary files to the web server. This critical vulnerability can lead to full site compromise.

There is no known public exploit, and it is not in the CISA KEV. The vulnerability is remotely exploitable.

Recommended Action

Update the ZoomSounds plugin to version 6.05 or later.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-4457 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.