CVE-2025-29897 Stack-based Buffer Overflow in qsyncsrv.cgi
Remote authenticated attackers can exploit a stack-based buffer overflow in Qsync Central to modify memory or crash processes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-29897?
CVE-2025-29897 is a low-severity memory corruption vulnerability in QNAP Systems Inc. Qsync Central, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A buffer copy without checking size of input vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.
We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 and later
Which versions are affected by CVE-2025-29897?
How do I fix CVE-2025-29897?
No fix has been published for CVE-2025-29897 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-29897 being exploited?
There is no known exploitation of CVE-2025-29897 in the wild and no public exploit code.
Sources
Also known as GHSA-9ww8-86rx-gwm9.