How severe is CVE-2024-4040?

CVE-2024-4040 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which products are affected by CVE-2024-4040?

CVE-2024-4040 affects the following products: crushftp crushftp.

How do I patch CVE-2024-4040?

Apply the crushftp crushftp security patch or hotfix for CVE-2024-4040 on the affected version, following the vendor advisory for your exact build.

How do I detect CVE-2024-4040 across my infrastructure?

Inventory every crushftp crushftp deployment and check each version against the affected-products list above.

How do I mitigate CVE-2024-4040 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2024-4040 actively exploited in the wild?

Yes. There are 21 known exploit references for CVE-2024-4040, including 13 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2024-4040?

CVE-2024-4040 has an EPSS (Exploit Prediction Scoring System) score of 99.5%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2024-4040 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2024-4040 (CrushFTP VFS Sandbox Escape Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2024-04-24. CISA required all US federal civilian agencies to remediate this vulnerability by 2024-05-01. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2024-4040?

CVE-2024-4040 is classified as CWE-1336 (CWE-1336), Code Injection (CWE-94). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2024-4040?

CVE-2024-4040 affects crushftp crushftp. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2024-4040?

A Nuclei detection template exists for CVE-2024-4040, meaning automated scanners can fingerprint it. 2 Metasploit modules reference CVE-2024-4040, which lowers the barrier to weaponization. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2024-4040 published, and has it been updated?

CVE-2024-4040 was published on April 22, 2024 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

CISA KEV · ACTIVELY EXPLOITED

CRITICAL severity

CVE-2024-4040 — Crushftp

CRITICAL

CVE-2024-4040 is a critical-severity (CVSS 9.8) CWE-1336 vulnerability in crushftp crushftp. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-04-24) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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…

Published

Apr 22, 2024

Updated

Jun 17, 2026

Affected

1 product

Patched

See advisory

Exploits

21 known

Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-04-24. Federal agencies were required to remediate by 2024-05-01.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2024-4040.

EPSS Exploitation Probability

via FIRST.org ↗

99.5%probability of exploitation in next 30 days

Very High Risk0.00%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2024-4040 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

Description

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

1 product · 2 configurations

Application

crushftpcrushftp

≥ 11.0.0 && < 11.1.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.