CVE-2021-24552Public exploitNetwork attack vector

Authenticated SQL injection via unquoted event identifier

Published Aug 23, 2021 · Updated Aug 3, 2024

SQL injection in Jerry Rietveld Simple Events Calendar 1.4.0 and earlier allows remote authenticated users to execute arbitrary SQL. The delete-event handler copies the event_id POST value directly into unquoted DELETE and SELECT statements in simple-events-calendar.php. Administrator access to the existing-events page is required; the published proof of concept demonstrates a time-based database query and database identity retrieval.

CVSS severity7.2
High
EPSS probability1.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Jerry Rietveld Simple Events Calendar 1.4.0 and earlier allows remote authenticated users to execute arbitrary SQL. The delete-event handler copies the event_id POST value directly into unquoted DELETE and SELECT statements in simple-events-calendar.php. Administrator access to the existing-events page is required; the published proof of concept demonstrates a time-based database query and database identity retrieval.

The record

CVE
CVE-2021-24552
Published
Aug 23, 2021
Updated
Aug 3, 2024
Vendor
Jerry Rietveld
Product
Simple Events Calendar
Classifications
CWE-89, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.4.0 <=1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Jerry Rietveld · Simple Events Calendarversion=1.4.0 <=1.4.0

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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