CVE-2021-4457: The ZoomSounds plugin before 6.05 contains a PHP file allowing unauthenticated users to upload an arbitrary fi

Q: How do I fix CVE-2021-4457?

zoomsounds: upgrade to 6.05. Exact commands for each OS are on this page.

Q: Is CVE-2021-4457 being exploited?

CVE-2021-4457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4457 affect?

CVE-2021-4457 affects zoomsounds. Severity is critical (CVSS 9.1). The ZoomSounds plugin before 6.05 contains a PHP file allowing unauthenticated users to upload an arbitrary file anywhere on the web server.

Q: How urgent is CVE-2021-4457?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2021-4457 is a critical-severity flaw (CVSS 9.1) affecting zoomsounds. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-06-25
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: digitalzoomstudio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-25 15:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

digitalzoomstudio zoomsounds UPGRADE

Affected: < 6.05

Fixed in: 6.05

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zoomsounds || rpm -q zoomsounds || zoomsounds --version

2. UPGRADE to 6.05 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zoomsounds

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zoomsounds

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4457?

zoomsounds: upgrade to 6.05. Exact commands for each OS are on this page.

Is CVE-2021-4457 being exploited?

CVE-2021-4457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4457 affect?

CVE-2021-4457 affects zoomsounds. Severity is critical (CVSS 9.1). The ZoomSounds plugin before 6.05 contains a PHP file allowing unauthenticated users to upload an arbitrary file anywhere on the web server.

How urgent is CVE-2021-4457?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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