CVE-2021-42669

Name: CVE-2021-42669
Creator: NVD / NIST
Published: 2021-11-05T13:15:09.213+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 23.27%

Last modified Jun 17, 2026

CVE-2021-42669 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A file upload vulnerability exists in Sourcecodester Engineers Online Portal in PHP via dashboard_teacher.php, which allows changing the avatar through teacher_avatar.php. Once an avatar gets uploaded it is getting uploaded to the /admin/uploads/ directory, and is accessible by all users. EPSS estimates a 23.27% chance of exploitation in the next 30 days.

Description

A file upload vulnerability exists in Sourcecodester Engineers Online Portal in PHP via dashboard_teacher.php, which allows changing the avatar through teacher_avatar.php. Once an avatar gets uploaded it is getting uploaded to the /admin/uploads/ directory, and is accessible by all users. By uploading a php webshell containing "<?php system($_GET["cmd"]); ?>" the attacker can execute commands on the web server with - /admin/uploads/php-webshell?cmd=id.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

23.27%

97.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Engineers Online Portal Project	Engineers Online Portal	All versions

References

https://github.com/TheHackingRabbi/CVE-2021-42669Exploit, Third Party Advisory
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit, Third Party Advisory
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct, Third Party Advisory
https://github.com/TheHackingRabbi/CVE-2021-42669Exploit, Third Party Advisory
https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-42671Exploit, Third Party Advisory
https://www.sourcecodester.com/php/13115/engineers-online-portal-php.htmlProduct, Third Party Advisory

Timeline

Published: Nov 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42669?

How severe is CVE-2021-42669?

CVE-2021-42669 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 23.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42669?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42669?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST