CVE-2025-29896: QNAP Qsync Central NULL pointer dereference

CVE-2025-29896 · Severity: info · Published 2026-10-15

Qsync Central is a file synchronization service for QNAP NAS devices. A NULL pointer dereference vulnerability allows an authenticated remote attacker to crash the service, causing a denial of service. The vulnerability requires the attacker to already have a valid user account on the system.

Technologies: QNAP Qsync Central. Vendors: QNAP.

Quick answers

Is CVE-2025-29896 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-29896 being exploited in the wild.
How severe is CVE-2025-29896?
Informational severity, published 15 October 2026.
Which products and versions are affected?
QNAP Qsync Central before 5.0.0.4.
Is there a fix for CVE-2025-29896?
Yes: fixed in Qsync Central 5.0.0.4 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-29896 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2025-29896?
Check whether you run QNAP Qsync Central 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: Qsync Central 5.0.0.4 and later

Technical details

A NULL pointer dereference in Qsync Central allows an authenticated remote attacker to trigger a denial-of-service condition by causing the application to crash. The vulnerability requires prior authentication with a valid user account. The attack vector is network-based and does not require elevated privileges or additional user interaction beyond account access.

Affected products

  • QNAP Qsync Central before 5.0.0.4

Timeline

  • 2026-10-15: disclosed

References

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