CVE-2021-24355: In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and in

Routine

MEDIUM 4.3UPGRADE

CVE-2021-24355 is a medium-severity flaw (CVSS 4.3) affecting simple 301 redirects. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and insufficient nonce check on the AJAX actions, simple301redirects/admin/get_wildcard and simple301redirects/admin/wildcard, made it possible for authenticated users to retrieve and update the wildcard value for redirects.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 46%)
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-2021-24355?

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

Is CVE-2021-24355 being exploited?

CVE-2021-24355 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-2021-24355 affect?

CVE-2021-24355 affects simple 301 redirects. Severity is medium (CVSS 4.3). In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and insufficient nonce check on the AJAX actions, simple301redirects/admin/get_wildcard and simple301redirects/admin/wildcard, made it p

How urgent is CVE-2021-24355?

Priority 34/100. 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
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References

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