CVE-2021-4457Public exploitNetwork attack vector

Unauthenticated file upload via savepng.php

Published Jun 25, 2025 · Updated Jul 1, 2025

Unrestricted file upload in Digital Zoom Studio ZoomSounds before 6.05 allows remote attackers to write arbitrary files to the web server. The publicly reachable savepng.php endpoint uses a request-supplied location value to write the submitted body without authentication or file-type restrictions. Network access to the WordPress plugin path is sufficient to place attacker-chosen PHP content within the site and execute it under the web service account.

CVSS severity9.1
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Digital Zoom Studio ZoomSounds before 6.05 allows remote attackers to write arbitrary files to the web server. The publicly reachable savepng.php endpoint uses a request-supplied location value to write the submitted body without authentication or file-type restrictions. Network access to the WordPress plugin path is sufficient to place attacker-chosen PHP content within the site and execute it under the web service account.

The record

CVE
CVE-2021-4457
Published
Jun 25, 2025
Updated
Jul 1, 2025
Vendor
Digital Zoom Studio
Product
ZoomSounds
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Digital Zoom Studio · ZoomSoundsversion=0 <6.05

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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