---
title: "CVE-2024-4040: CrushFTP VFS Sandbox Escape Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-4040/
description: "CVE-2024-4040 (CrushFTP CrushFTP): Exploited in the wild (CISA KEV). A server side template injection vulnerability in CrushFTP in all versions before…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-04-22
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-4040"
kev: true
cvss: 9.8
epss: 0.99539
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-4040: CrushFTP VFS Sandbox Escape Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run CrushFTP CrushFTP. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-04-24, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-05-01 ; treat that as the outer limit, not the target.
- EPSS 99.5% , percentile 99.9: FIRST’s model estimates a 99.5% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

A server side template injection vulnerability in CrushFTP in all versions before 10.7.1 and 11.1.0 on all platforms allows unauthenticated remote attackers to read files from the filesystem outside of the VFS Sandbox, bypass authentication to gain administrative access, and perform remote code execution on the server.

## Affected products (CVE record)

- CrushFTP CrushFTP: 10.0 < 10.7.1, 11.0 < 11.1.0

## Severity

- directcyber CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-04-24; federal due date 2024-05-01. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.54% probability of exploitation activity in the next 30 days; percentile 99.9.

## Sources

- [crushftp.com](https://www.crushftp.com/crush11wiki/Wiki.jsp?page=Update)
- [crushftp.com](https://www.crushftp.com/crush10wiki/Wiki.jsp?page=Update)
- [Listed in CISA KEV notes (crushftp.com)](https://www.crushftp.com/crush11wiki/Wiki.jsp?page=Update&version=34)
- [CVE.org record CVE-2024-4040](https://www.cve.org/CVERecord?id=CVE-2024-4040)
- [NVD entry CVE-2024-4040](https://nvd.nist.gov/vuln/detail/CVE-2024-4040)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-4040)
- [reddit.com](https://www.reddit.com/r/cybersecurity/comments/1c850i2/all_versions_of_crush_ftp_are_vulnerable/)
- [bleepingcomputer.com](https://www.bleepingcomputer.com/news/security/crushftp-warns-users-to-patch-exploited-zero-day-immediately/)
- [reddit.com](https://www.reddit.com/r/crowdstrike/comments/1c88788/situational_awareness_20240419_crushftp_virtual/)
- [rapid7.com](https://www.rapid7.com/blog/post/2024/04/23/etr-unauthenticated-crushftp-zero-day-enables-complete-server-compromise/)
- [github.com](https://github.com/airbus-cert/CVE-2024-4040)

---
Source page: https://erroneo.us/security/cve/CVE-2024-4040/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt