Read the docs
TI-2026-74604 Aliases CVE-2026-24721GHSA-mfr5-9c36-8rh4

NULL pointer dereference in QNAP File Station 5 enables denial of service

Priority LOW 24CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

QNAP File Station 5 contains a NULL pointer dereference (CWE-476) that a remote attacker with a user account can trigger to cause a denial of service. The affected versions are from 5.5.x before 5.5.6.5243.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A NULL pointer dereference vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5243 and later

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0028 20th percentileScored 2026-11-07
Fix Fixed File Station 5 (QNAP Systems Inc.): 5.5.6.5243

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QNAPFile Station 55.5.x to before 5.5.6.52435.5.6.5243Patch availableCNA
  • File Station 5 VendorQNAP Affected 5.5.x to before 5.5.6.5243 Fixed in 5.5.6.5243 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:*before 5.5.6.5243VulnerableQNAP
  • cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:* Versions before 5.5.6.5243 Vulnerable ·QNAP

Remediation

Update QNAP File Station 5 to version 5.5.6.5243 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA File Station 5 (QNAP Systems Inc.) Fixed in 5.5.6.5243

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    QNAP Systems File Station 5 5.5.6.5243

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-74606 NULL Pointer Dereference in utilRequest.cgiPriority LOW 24
    • TI-2026-74605 Null pointer dereference in QNAP File Station 5 allows DoSPriority LOW 24
    Show all 3 records →

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-24721
  2. 2026-10-16 Alias added: GHSA-mfr5-9c36-8rh4
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-16 CVSS score added · NVD

References

Other 1

  • TI-2025-24025 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21598 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21273 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21272 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2025-21271 Improper certificate validation in QNAP File Station 5 CVSS 4.0HIGH 8.3
  • TI-2026-19932 Incorrect authorization in QNAP File Station 5 CVSS 4.0MEDIUM 6.2
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences