How severe is CVE-2021-24356?

CVE-2021-24356 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24356 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24356?

CVE-2021-24356 affects Wpdeveloper Simple 301 Redirects. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24356?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-24356 published?

CVE-2021-24356 was published on 2021-06-14 and last updated on 2026-06-17.

CVE-2021-24356

CVE-2021-24356 is a high-severity vulnerability in Wpdeveloper Simple 301 Redirects with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Wpdeveloper Simple 301 Redirects
Published: 2021-06-14
Last modified: 2026-06-17

Description

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

Frequently asked questions

What is CVE-2021-24356?: In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.
How severe is CVE-2021-24356?: CVE-2021-24356 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24356 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24356?: CVE-2021-24356 affects Wpdeveloper Simple 301 Redirects. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24356?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-24356 published?: CVE-2021-24356 was published on 2021-06-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wpdeveloper:simple_301_redirects:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Wpdeveloper Simple 301 Redirects

CVE-2021-24354 — High (CVSS 8.8): A lack of capability checks and insufficient nonce check on the AJAX action in the Simple 301 Redirects by BetterLinks…
CVE-2021-24353 — High (CVSS 8.8): The import_data function of the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4 had no capability or…
CVE-2021-24352 — High (CVSS 8.8): The export_data function of the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4 had no capability or…
CVE-2021-24355 — Medium (CVSS 4.3): In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and…

All CVEs affecting Wpdeveloper Simple 301 Redirects →

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