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PatchSiren cyber security CVE debrief

CVE-2026-24723 QNAP Systems Inc. CVE debrief

A NULL pointer dereference vulnerability in File Station 5's utilRequest.cgi can allow a remote attacker with a user account to launch a denial-of-service (DoS) attack. QNAP Systems Inc. has fixed the vulnerability in File Station 5 version 5.5.6.5243 and later. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. The CVE Program and NVD records confirm the vulnerability and its details. Administrators should prioritize patching to version 5.5.6.5243 or later and verify vulnerability status for existing deployments.

Vendor
QNAP Systems Inc.
Product
File Station 5
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-15
Original CVE updated
2026-10-15
Advisory published
2026-10-15
Advisory updated
2026-10-15

Who should care

File Station 5 administrators and users should assess exposure and prioritize patching to version 5.5.6.5243 or later. They should also verify vulnerability status for existing deployments and monitor for potential DoS attacks targeting File Station 5. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-24723 allows remote attackers with user accounts to launch DoS attacks on File Station 5. Administrators should prioritize patching to version 5.5.6.5243 or later and verify vulnerability status for existing deployments.

  • Potential disruption of File Station 5 services
  • Need for verification of vulnerability status in existing deployments
  • Priority patching for version 5.5.6.5243 or later

Technical summary

A NULL pointer dereference vulnerability exists in the utilRequest.cgi of File Station 5. An attacker with a user account can exploit this vulnerability to launch a denial-of-service (DoS) attack. The vulnerability has been fixed in version 5.5.6.5243 and later. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. The CVE Program and NVD records confirm the vulnerability and its details. The source item record also confirms the vulnerability. The vulnerability can be exploited by a remote attacker with a user account.

Defensive priority

Medium-priority patching and verification recommended for File Station 5 deployments

Recommended defensive actions

  • Patch File Station 5 to version 5.5.6.5243 or later
  • Verify vulnerability status for existing File Station 5 deployments
  • Monitor for potential DoS attacks targeting File Station 5
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program and NVD records confirm the vulnerability and its details. QNAP Systems Inc. provides release notes mentioning the fix in version 5.5.6.5243. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. The CVE record was published on 2026-10-15T06:59:47.676Z and has not been modified since then. The source item record also confirms the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-24723 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-24723

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

  • CVE-2026-24723 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-24723

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

Supplemental references

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.