CVE-2021-24240: The Business Hours Pro WordPress plugin through 5.5.0 allows a remote attacker to upload arbitrary files using

Q: How do I fix CVE-2021-24240?

business hours pro: upgrade to newer than 5.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-24240 being exploited?

CVE-2021-24240 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24240 affect?

CVE-2021-24240 affects business hours pro. Severity is critical (CVSS 9.8). The Business Hours Pro WordPress plugin through 5.5.0 allows a remote attacker to upload arbitrary files using its manual update functionality, leading to an unauthenticated remote code execution vulnerability.

Q: How urgent is CVE-2021-24240?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2021-24240 is a critical-severity flaw (CVSS 9.8) affecting business hours pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Business Hours Pro WordPress plugin through 5.5.0 allows a remote attacker to upload arbitrary files using its manual update functionality, leading to an unauthenticated remote code execution vulnerability.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 12%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-04-22
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: aivahthemes

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-22 21:15 UTCPublished CVE record published
2026-06-17 03:39 UTCUpdated Record last modified

aivahthemes business hours pro UPGRADE

Affected: <= 5.5.0

Fixed in: newer than 5.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy business-hours-pro || rpm -q business-hours-pro || business-hours-pro --version

2. UPGRADE to newer than 5.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade business-hours-pro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade business-hours-pro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-24240?

business hours pro: upgrade to newer than 5.5.0. Exact commands for each OS are on this page.

Is CVE-2021-24240 being exploited?

CVE-2021-24240 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-24240 affect?

CVE-2021-24240 affects business hours pro. Severity is critical (CVSS 9.8). The Business Hours Pro WordPress plugin through 5.5.0 allows a remote attacker to upload arbitrary files using its manual update functionality, leading to an unauthenticated remote code execution vulnerability.

How urgent is CVE-2021-24240?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

References

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