CVE-2021-42666Public exploitNetwork attack vector

Authenticated database disclosure via UNION query injection

Published Nov 5, 2021 · Updated Aug 4, 2024

SQL injection in SourceCodester Engineers Online Portal 1.0 allows remote authenticated users to extract database data through a crafted quiz id. The quiz_question.php handler incorporates the id query parameter into an SQL statement without neutralizing SQL syntax, so a UNION payload changes the query and returns the MySQL version. A valid PHP session is required; the demonstrated consequence is database disclosure, while server-side code execution depends on database privileges and configuration.

CVSS severity8.8
High
EPSS probability4.48%
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 SourceCodester Engineers Online Portal 1.0 allows remote authenticated users to extract database data through a crafted quiz id. The quiz_question.php handler incorporates the id query parameter into an SQL statement without neutralizing SQL syntax, so a UNION payload changes the query and returns the MySQL version. A valid PHP session is required; the demonstrated consequence is database disclosure, while server-side code execution depends on database privileges and configuration.

The record

CVE
CVE-2021-42666
Published
Nov 5, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
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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