CVE-2024-4040: CrushFTP VFS Sandbox Escape Vulnerability

Patch now

CRITICAL 9.8EXPLOITEDREMOTEUPGRADE

CVE-2024-4040 is a critical-severity flaw (CVSS 9.8) affecting crushftp, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	99.5% (top 1%)
CISA exploited list	Yes, fix due 2024-05-01
Weakness	CWE-1336, CWE-94
Published	2024-04-22
Last modified	2026-06-17

Publisher (CNA): DirectCyber · Vendor: crushftp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-22 20:15 UTCPublished CVE record published
2024-04-24Exploited Added to the CISA Known Exploited Vulnerabilities list
2024-05-01Deadline CISA due date for US federal agencies to patch
2026-06-17 08:00 UTCUpdated Record last modified

crushftp crushftp UPGRADE

Affected: >= 10.0.0 and < 10.7.1 · >= 11.0.0 and < 11.1.0

Fixed in: 10.7.1, 11.1.0

Safe to downgrade to: a release before 10.0.0

1. Check installed version

apt-cache policy crushftp || rpm -q crushftp || crushftp --version

2. UPGRADE to 10.7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade crushftp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crushftp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0.0 (Debian / Ubuntu)

apt-cache madison crushftp sudo apt install crushftp=<VERSION_BEFORE_10.0.0> sudo apt-mark hold crushftp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list crushftp sudo dnf downgrade crushftp-<VERSION_BEFORE_10.0.0> sudo dnf versionlock add crushftp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · efifs · FIXED · 1.13-1.eln159 · FEDORA-2026-3fd0bb7307 · source

sudo dnf upgrade --advisory=FEDORA-2026-3fd0bb7307

Fedora 46 · efifs · FIXED · 1.13-1.fc46 · FEDORA-2026-27ec2fc8fc · source

sudo dnf upgrade --advisory=FEDORA-2026-27ec2fc8fc

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Stuub/CVE-2024-4040-SSTI-LFI-PoC (66 stars)
GitHub PoC: airbus-cert/CVE-2024-4040 (56 stars)
GitHub PoC: rbih-boulanouar/CVE-2024-4040 (15 stars)
Write-up: www.bleepingcomputer.com/news/security/crushftp-warns-users-to-patch-exploited-zero-day-im
Write-up: www.rapid7.com/blog/post/2024/04/23/etr-unauthenticated-crushftp-zero-day-enables-complete
GitHub PoC: 0xN7y/CVE-2024-4040
Metasploit: CrushFTP Unauthenticated Arbitrary File Read
Nuclei scan template: CrushFTP VFS - Sandbox Escape LFR

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-4040?

crushftp: upgrade to 10.7.1, 11.1.0. Exact commands for each OS are on this page.

Is CVE-2024-4040 being exploited?

Yes. CVE-2024-4040 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2024-4040 affect?

CVE-2024-4040 affects crushftp. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2024-4040?

Priority 97/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-63420 MEDIUM 4.1 UPGRADE CrushFTP11 before 11.3.7_57 is vulnerable to stored HTML injection in the CrushFTP Admin Panel (Reports / "Who
CVE-2025-63419 MEDIUM 6.1 UPGRADE Cross Site Scripting (XSS) vulnerability in CrushFTP 11.3.6_48
CVE-2025-54309 CRITICAL 9.0 EXPLOITED UPGRADE CrushFTP Unprotected Alternate Channel Vulnerability
CVE-2025-32103 MEDIUM 5.0 UPGRADE CrushFTP 9.x and 10.x through 10.8.4 and 11.x through 11.3.1 allows directory traversal via the /WebInterface/
CVE-2025-32102 MEDIUM 5.0 UPGRADE CrushFTP 9.x and 10.x through 10.8.4 and 11.x through 11.3.1 allows SSRF via the host and port parameters in a

References

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