Actively exploited

CVE-2024-4040 CrushFTP VFS Sandbox Escape Vulnerability

CrushFTP contains an unspecified sandbox escape vulnerability that allows a remote attacker to escape the CrushFTP virtual file system (VFS).

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment

CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 24 Apr 2024.
Rated Critical severity (CVSS 9.8, scored by Vendor).
It has been in the catalogue for 926 days. Systems still unpatched now have almost certainly been scanned for it.

The Vulnerability

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 Versions

Product	Versions
CrushFTP CrushFTP	10.0 to before 10.7.1 11.0 to before 11.1.0

From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.

From Watch to Action

What To Do Now

1
Find it
Search your asset inventory and external attack surface for CrushFTP. Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management
2
Fix it
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Management
3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response
4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated critical, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 1 May 2024 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

Stay Ahead

More Exploited CrushFTP Flaws

All 3 exploited CrushFTP vulnerabilities

Not Sure If You Are Exposed?

Our attack surface and vulnerability teams can check your internet-facing estate for CVE-2024-4040 and every other exploited flaw on the list.

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Evidence

PREVENTION

DETECTION & MITIGATION

GRC

INCIDENT RESPONSE

CLOUD SECURITY

CRITICAL INFRASTRUCTURE

REGULATED SERVICES

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COMMERCIAL

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MANAGED SECURITY

NETWORK & CLOUD

RISK & COMPLIANCE

DATA & APPLICATIONS

PEOPLE & EMAIL

FOR VENDORS

CVE-2024-4040 CrushFTP VFS Sandbox Escape Vulnerability

Should You Worry?

What It Is

Affected Versions

What To Do Now

Find it

Fix it

Hunt for compromise

Prove it is fixed

Vendor Advisories

The Compliance Clock

More Exploited CrushFTP Flaws

Not Sure If You Are Exposed?

Sources