CVE-2021-4449Public exploitNetwork attack vector

Unauthenticated file write via unvalidated savepng.php upload

Published Oct 16, 2024 · Updated Apr 8, 2026

Unrestricted file upload in Digital Zoom Studio ZoomSounds 5.96 and earlier allows remote attackers to write arbitrary server files. The savepng.php handler accepts a request body and location parameter without validating the file type, then writes the payload under the plugin path. No WordPress account is required; code execution follows when the web server treats an uploaded PHP file as executable.

CVSS severity9.8
Critical
EPSS probability5.44%
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 5.96 and earlier allows remote attackers to write arbitrary server files. The savepng.php handler accepts a request body and location parameter without validating the file type, then writes the payload under the plugin path. No WordPress account is required; code execution follows when the web server treats an uploaded PHP file as executable.

The record

CVE
CVE-2021-4449
Published
Oct 16, 2024
Updated
Apr 8, 2026
Vendor
Digital Zoom Studio
Product
ZoomSounds
Classifications
CWE-434, T1190, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=5.96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Digital Zoom Studio · ZoomSoundsversion=0 <=5.96

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
T1505.003Web Shell

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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