# CVE-2026-24721: QNAP File Station 5 NULL pointer dereference

Source: https://junglewise.ai/threats/cve-2026-24721-a-null-pointer-dereference-vulnerability-has-been-reported-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-24721 · Severity: medium · CVSS 6.5 · Published 2026-10-15

QNAP File Station 5 is a file management application for network-attached storage devices. A NULL pointer dereference vulnerability allows authenticated remote attackers to crash the application and cause a denial-of-service, disrupting file access for users.

Technologies: [QNAP File Station](https://junglewise.ai/threats/technologies/file-station), [QNAP File Station 5](https://junglewise.ai/threats/technologies/qnap-file-station-5). Vendors: [QNAP](https://junglewise.ai/threats/vendors/qnap).

## Quick answers

**Is CVE-2026-24721 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-24721 being exploited in the wild.

**How severe is CVE-2026-24721?** Medium severity, with a CVSS score of 6.5, published 15 October 2026.

**Which products and versions are affected?** QNAP File Station 5 before 5.5.6.5243.

**Is there a fix for CVE-2026-24721?** Yes: fixed in File Station 5 5.5.6.5243 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-24721 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-24721?** Check whether you run QNAP File Station or QNAP File Station 5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in File Station 5 5.5.6.5243 and later

## Technical details

A NULL pointer dereference in File Station 5 allows an authenticated remote attacker to trigger a denial-of-service condition. The vulnerability requires prior user account access to exploit. No active exploitation in the wild has been reported.

## Affected products

- QNAP File Station 5 before 5.5.6.5243

## Timeline

- 2026-10-15: disclosed

## References

- [https://www.qnap.com/en/app-release-notes?keyword=FileStation5&app=FileStation5&product-line=nas](https://www.qnap.com/en/app-release-notes?keyword=FileStation5&app=FileStation5&product-line=nas)

## Related threats

- [QNAP File Station 5 NULL pointer dereference](https://junglewise.ai/threats/cve-2026-24723-a-null-pointer-dereference-vulnerability-has-been-reported-to)
- [QNAP File Station 5 NULL pointer dereference](https://junglewise.ai/threats/cve-2026-24722-a-null-pointer-dereference-vulnerability-has-been-reported-to)
- [QNAP File Station resource exhaustion vulnerability](https://junglewise.ai/threats/cve-2026-24720-qnap-file-station-resource-exhaustion-vulnerability)
- [QNAP File Station NULL pointer dereference in File Station 6](https://junglewise.ai/threats/cve-2026-22899-qnap-file-station-null-pointer-dereference-in-file-station-6)
- [A cross-site scripting (XSS) vulnerability has been reported to affect File Station 5. If a remote attacker gains a…](https://junglewise.ai/threats/cve-2025-57706-a-cross-site-scripting-xss-vulnerability-has-been-reported-to)