HOME VULNERABILITIESCVE-2021-42666

HIGH

CVE-2021-42666

CWE-89Published: November 5, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

A SQL Injection vulnerability exists in Sourcecodester Engineers Online Portal in PHP via the id parameter to quiz_question.php, which could let a malicious user extract sensitive data from the web server and in some cases use this vulnerability in order to get a remote code execution on the remote web server.

Technical Analysis

CVE-2021-42666 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

From a weakness classification perspective (CWE-89): SQL injection vulnerabilities allow attackers to manipulate database queries, potentially exposing or modifying sensitive data.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

engineers_online_portal_project1 product(s)

engineers online portal

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/TheHackingRabbi/CVE-2021-42666

ADVISORYhttps://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/janobe/CVE-nu11-101321

ADVISORYhttps://www.exploit-db.com/exploits/50453

ADVISORYhttps://www.sourcecodester.com/php/13115/engineers-online-portal-php.html

ADVISORYhttps://github.com/TheHackingRabbi/CVE-2021-42666

ADVISORYhttps://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/janobe/CVE-nu11-101321

ADVISORYhttps://www.exploit-db.com/exploits/50453

ADVISORYhttps://www.sourcecodester.com/php/13115/engineers-online-portal-php.html

All References (8)

→

https://github.com/TheHackingRabbi/CVE-2021-42666Exploit · Third Party Advisory

→

https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/janobe/CVE-nu11-101321Exploit · Third Party Advisory

→

https://www.exploit-db.com/exploits/50453Exploit · Third Party Advisory · VDB Entry

→

https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct · Third Party Advisory

→

https://github.com/TheHackingRabbi/CVE-2021-42666Exploit · Third Party Advisory

→

https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/janobe/CVE-nu11-101321Exploit · Third Party Advisory

→

https://www.exploit-db.com/exploits/50453Exploit · Third Party Advisory · VDB Entry

→

https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct · Third Party Advisory

Quick Facts

CVE IDCVE-2021-42666

CVSS Score8.8 / 10

SeverityHIGH

WeaknessCWE-89

CISA KEVNo

Affected1 vendor(s)

PublishedNov 5, 2021

Related CVEs (CWE-89)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-42666 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

← All Vulnerabilities·Search for CVE-2021-42666·NVD