CVE-2021-39409

Name: CVE-2021-39409
Creator: NVD / NIST
Published: 2022-06-24T17:15:08.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.74%

Last modified Jun 17, 2026

CVE-2021-39409 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator without needing to be authenticated.. EPSS estimates a 2.74% chance of exploitation in the next 30 days.

Description

A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator without needing to be authenticated.

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

2.74%

84.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Online Student Rate System Project	Online Student Rate System	1.0

References

https://github.com/StefanDorresteijn/CVE-2021-39409Exploit, Third Party Advisory
https://github.com/StefanDorresteijn/CVE-2021-39409Exploit, Third Party Advisory

Timeline

Published: Jun 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39409?

A vulnerability exists in Online Student Rate System v1.0 that allows any user to register as an administrator without needing to be authenticated.

How severe is CVE-2021-39409?

CVE-2021-39409 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39409?

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-2021-39409?

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

Scan your code now

Source: NVD / NIST