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PatchSiren cyber security CVE debrief

CVE-2024-4040 CrushFTP CVE debrief

CVE-2024-4040 is a CrushFTP VFS sandbox escape vulnerability that CISA added to the Known Exploited Vulnerabilities catalog on 2024-04-24, the same date it was published in the supplied timeline. CISA set a remediation due date of 2024-05-01. Because it is listed in KEV, defenders should treat this as an urgent exposure-management item and follow vendor mitigation guidance without delay.

Vendor
CrushFTP
Product
CrushFTP
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2024-04-24
Original CVE updated
2024-04-24
Advisory published
2024-04-24
Advisory updated
2024-04-24

Who should care

CrushFTP administrators, security teams responsible for file-transfer infrastructure, and anyone operating a CrushFTP deployment that is reachable by users or external networks.

Technical summary

The vulnerability is described as a VFS sandbox escape in CrushFTP, which indicates a failure of intended filesystem isolation boundaries. The source corpus does not provide exploit mechanics, impact scope beyond the name, or a CVSS score, but CISA’s KEV listing confirms it is considered actively exploited and requires immediate mitigation or removal if mitigation is not available.

Defensive priority

Urgent. CISA listed the issue in KEV on 2024-04-24 and set a due date of 2024-05-01, so remediation should be prioritized ahead of routine patch cycles.

Recommended defensive actions

  • Apply the vendor’s mitigation or update guidance for CrushFTP immediately.
  • If mitigations are unavailable or cannot be applied, discontinue use of the product as directed by CISA.
  • Verify which CrushFTP instances are deployed and whether any are exposed to untrusted users or networks.
  • Use the official CVE and NVD records to track status and confirm remediation is complete.

Evidence notes

This debrief is based only on the supplied CISA KEV source item and the official CVE/NVD/CISA links provided. The source item metadata identifies CVE-2024-4040 as 'CrushFTP VFS Sandbox Escape Vulnerability,' marks it as KEV-listed, and records dateAdded 2024-04-24, dueDate 2024-05-01, and the required action to apply vendor mitigations or discontinue use if mitigations are unavailable. No CVSS score or vendor exploit details were supplied in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-4040 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-4040

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-4040 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-4040

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.