CVE-2021-33224

Name: CVE-2021-33224
Creator: NVD / NIST
Published: 2023-02-24T16:15:11.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2021-33224 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.

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

0.74%

49.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Umbraco	Umbraco Forms	8.7.0

References

http://umbraco.comProduct
https://our.umbraco.com/packages/developer-tools/umbraco-formsRelease Notes
http://umbraco.comProduct
https://our.umbraco.com/packages/developer-tools/umbraco-formsRelease Notes

Timeline

Published: Feb 24, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33224?

File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.

How severe is CVE-2021-33224?

CVE-2021-33224 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33224?

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-2021-33224?

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

Scan your code now

Source: NVD / NIST