CVE-2021-24240Known exploitationNetwork attack vector

Unauthenticated code execution via manual-update file upload

Published Apr 22, 2021 · Updated Aug 3, 2024

Unrestricted file upload in Business Hours Pro 5.5.0 and earlier allows remote attackers to execute code through manual updates. The manual update functionality accepts arbitrary attacker-supplied files, but public sources do not identify the responsible file, function, or missing validation check. No authentication or user interaction is required, and successful upload permits code execution in the WordPress site's server context.

CVSS severity9.8
Critical
EPSS probability3.04%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unrestricted file upload in Business Hours Pro 5.5.0 and earlier allows remote attackers to execute code through manual updates. The manual update functionality accepts arbitrary attacker-supplied files, but public sources do not identify the responsible file, function, or missing validation check. No authentication or user interaction is required, and successful upload permits code execution in the WordPress site's server context.

The record

CVE
CVE-2021-24240
Published
Apr 22, 2021
Updated
Aug 3, 2024
Vendor
AivahThemes
Product
Business Hours Pro
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.5.0 <=5.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AivahThemes · Business Hours Proversion=5.5.0 <=5.5.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/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
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo