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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
Unknown
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.

Official resources

Publicly disclosed and added to CISA’s Known Exploited Vulnerabilities catalog on 2024-04-24; CISA remediation due date was 2024-05-01.