CVE-2021-34639Network attack vector

Authenticated code execution via double-extension upload

Published Aug 5, 2021 · Updated Aug 4, 2024

Arbitrary file upload in W3 Eden WordPress Download Manager 3.1.24 and earlier allows remote authenticated users to execute PHP code. The upload validation checks only the final filename extension, so an Author can submit a double-extension file whose embedded PHP remains executable. Code execution requires an Apache/mod_php configuration using a permissive AddHandler or AddType directive, and the downloads directory access rules impede exploitation.

CVSS severity7.5
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in W3 Eden WordPress Download Manager 3.1.24 and earlier allows remote authenticated users to execute PHP code. The upload validation checks only the final filename extension, so an Author can submit a double-extension file whose embedded PHP remains executable. Code execution requires an Apache/mod_php configuration using a permissive AddHandler or AddType directive, and the downloads directory access rules impede exploitation.

The record

CVE
CVE-2021-34639
Published
Aug 5, 2021
Updated
Aug 4, 2024
Vendor
W3 Eden, Inc.
Product
WordPress Download Manager
Classifications
CWE-434, CWE-646, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=3.1.24 <=3.1.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

W3 Eden, Inc. · WordPress Download Managerversion=3.1.24 <=3.1.24

Published CVSS scores

7.5WordfenceCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-646Reliance on File Name or Extension of Externally-Supplied File
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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