CVE-2021-24354: A lack of capability checks and insufficient nonce check on the AJAX action in the Simple 301 Redirects by Bet

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HIGH 8.8UPGRADE

CVE-2021-24354 is a high-severity flaw (CVSS 8.8) affecting simple 301 redirects. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A lack of capability checks and insufficient nonce check on the AJAX action in the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, made it possible for authenticated users to install arbitrary plugins on vulnerable sites.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-862
Published	2021-06-14
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: wpdeveloper

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

Am I affected?

Timeline

2021-06-14 14:15 UTCPublished CVE record published
2026-06-17 03:39 UTCUpdated Record last modified

wpdeveloper simple 301 redirects UPGRADE

Affected: >= 2.0.0 and < 2.0.4

Fixed in: 2.0.4

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy simple-301-redirects || rpm -q simple-301-redirects || simple-301-redirects --version

2. UPGRADE to 2.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-301-redirects

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-301-redirects

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison simple-301-redirects sudo apt install simple-301-redirects=<VERSION_BEFORE_2.0.0> sudo apt-mark hold simple-301-redirects

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-301-redirects sudo dnf downgrade simple-301-redirects-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add simple-301-redirects

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-24354?

simple 301 redirects: upgrade to 2.0.4. Exact commands for each OS are on this page.

Is CVE-2021-24354 being exploited?

CVE-2021-24354 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-2021-24354 affect?

CVE-2021-24354 affects simple 301 redirects. Severity is high (CVSS 8.8). A lack of capability checks and insufficient nonce check on the AJAX action in the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, made it possible for authenticated users to install arbitrary plugins on vulnerable sites.

How urgent is CVE-2021-24354?

Priority 54/100. High severity; Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-24356 HIGH 8.8 UPGRADE In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insu
CVE-2021-24355 MEDIUM 4.3 UPGRADE In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and in
CVE-2021-24353 HIGH 8.8 UPGRADE The import_data function of the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4 had no capab
CVE-2021-24352 HIGH 8.8 UPGRADE The export_data function of the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4 had no capab
CVE-2019-15818 MEDIUM 6.1 UPGRADE The simple-301-redirects-addon-bulk-uploader plugin through 1.2.4 for WordPress has no requirement for authent

References

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