How severe is CVE-2021-24943?

CVE-2021-24943 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24943 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24943?

CVE-2021-24943 affects Roundupwp Registrations For The Events Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24943?

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

When was CVE-2021-24943 published?

CVE-2021-24943 was published on 2021-12-06 and last updated on 2026-06-17.

CVE-2021-24943

CVE-2021-24943 is a critical-severity vulnerability in Roundupwp Registrations For The Events Calendar with a CVSS 3.x base score of 9.8. 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Roundupwp Registrations For The Events Calendar
Published: 2021-12-06
Last modified: 2026-06-17

Description

The Registrations for the Events Calendar WordPress plugin before 2.7.6 does not sanitise and escape the event_id in the rtec_send_unregister_link AJAX action (available to both unauthenticated and authenticated users) before using it in a SQL statement, leading to an unauthenticated SQL injection.

Frequently asked questions

What is CVE-2021-24943?: The Registrations for the Events Calendar WordPress plugin before 2.7.6 does not sanitise and escape the event_id in the rtec_send_unregister_link AJAX action (available to both unauthenticated and authenticated users) before using it in a SQL statement, leading to an unauthenticated SQL injection.
How severe is CVE-2021-24943?: CVE-2021-24943 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24943 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24943?: CVE-2021-24943 affects Roundupwp Registrations For The Events Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24943?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-24943 published?: CVE-2021-24943 was published on 2021-12-06 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/ba50c590-42ee-4523-8aa0-87ac644b77ed

Affected products (1)

cpe:2.3:a:roundupwp:registrations_for_the_events_calendar:*:*:*:*:*:wordpress:*:*

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