CVE-2021-24160Public exploitNetwork attack vector

Authenticated code execution via unrestricted theme ZIP extraction

Published Apr 5, 2021 · Updated Aug 3, 2024

Arbitrary file upload in ExpressTech Systems Responsive Menu and Responsive Menu Pro before 4.0.4 allows remote authenticated users to execute PHP. The rmp_upload_theme function handles the admin_post_rmp_upload_theme_file action without checking the uploader's capability and extracts ZIP contents, including PHP files, into the web-accessible /rmp-menu/themes/ directory. A subscriber account is sufficient to place and invoke a PHP payload, permitting commands to run with the WordPress server process's privileges.

CVSS severity8.8
High
EPSS probability8.20%
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 ExpressTech Systems Responsive Menu and Responsive Menu Pro before 4.0.4 allows remote authenticated users to execute PHP. The rmp_upload_theme function handles the admin_post_rmp_upload_theme_file action without checking the uploader's capability and extracts ZIP contents, including PHP files, into the web-accessible /rmp-menu/themes/ directory. A subscriber account is sufficient to place and invoke a PHP payload, permitting commands to run with the WordPress server process's privileges.

The record

CVE
CVE-2021-24160
Published
Apr 5, 2021
Updated
Aug 3, 2024
Vendor
ExpressTech Systems
Product
Responsive Menu
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=4.0.4 <4.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ExpressTech Systems · Responsive Menuversion=4.0.4 <4.0.4
ExpressTech Systems · Responsive Menu Proversion=4.0.4 <4.0.4

Published CVSS scores

8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 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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