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

published February 24, 2023

CVSS
—
EPSS
1%
Percentile
53.8
In the wild
Unconfirmed
What it is

⚠️ A crafty file upload vulnerability in Umbraco Forms v8.7.0 is an open door for anyone to run arbitrary code! 😱 Think of it as a delivery service that unwittingly accepts packages without checking contents, allowing shady items inside the building without any vetting. An attacker could slip in a cleverly crafted `web.config` or ASP file, leading to remote code execution. This means they could take control of the server, modify files, and even access sensitive data—absolutely devastating!

Put simply

Think of it as a delivery service that unwittingly accepts packages without checking contents, allowing shady items inside the building without any vetting. This vulnerability allows unauthenticated attackers to upload malicious files to the server, potentially executing arbitrary code within the application environment.

What to do

An attacker could slip in a cleverly crafted `web.config` or ASP file, leading to remote code execution. This means they could take control of the server, modify files, and even access sensitive data—absolutely devastating! Immediately patch to Umbraco Forms version 8.7.1 or later to close this vulnerability. Also, ensure strict validation and sanitization of file uploads to prevent unauthorized files from being executed. You've got this! With these steps, you'll tighten up your defenses and keep your application safe! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00733 · 53.8th percentile
Published
2023-02-24T00:00Z
EPSS history
Timeline
  • 24 FEB 00:00Z
    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
    cvelistv5