How severe is CVE-2021-24633?

CVE-2021-24633 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-24633 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24633?

CVE-2021-24633 affects Wpdeveloper Countdown Block. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24633?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-24633 published?

CVE-2021-24633 was published on 2021-09-27 and last updated on 2026-06-17.

CVE-2021-24633

CVE-2021-24633 is a medium-severity vulnerability in Wpdeveloper Countdown Block with a CVSS 3.x base score of 4.3. 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: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Wpdeveloper Countdown Block
Published: 2021-09-27
Last modified: 2026-06-17

Description

The Countdown Block WordPress plugin before 1.1.2 does not have authorisation in the eb_write_block_css AJAX action, which allows any authenticated user, such as Subscriber, to modify post contents displayed to users.

Frequently asked questions

What is CVE-2021-24633?: The Countdown Block WordPress plugin before 1.1.2 does not have authorisation in the eb_write_block_css AJAX action, which allows any authenticated user, such as Subscriber, to modify post contents displayed to users.
How severe is CVE-2021-24633?: CVE-2021-24633 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-24633 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24633?: CVE-2021-24633 affects Wpdeveloper Countdown Block. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24633 published?: CVE-2021-24633 was published on 2021-09-27 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/431901eb-0f95-4033-b943-324e6d3844a5

Affected products (1)

cpe:2.3:a:wpdeveloper:countdown_block:*:*:*:*:*:wordpress:*:*

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