CVE-2025-53593 QTS, QuTS hero
Remote administrators can exploit a buffer overflow in QNAP operating systems to modify memory or crash processes.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-53593?
CVE-2025-53593 is a low-severity memory corruption vulnerability in Qnap Qts, published on 2 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to modify memory or crash processes.
We have already fixed the vulnerability in the following versions: QTS 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.1.3250 build 20250912 and later
Which versions are affected by CVE-2025-53593?
It affects 2 products.
Products include Qnap Qts, Qnap Quts Hero.
How do I fix CVE-2025-53593?
No fix has been published for CVE-2025-53593 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-2025-53593 being exploited?
There is no known exploitation of CVE-2025-53593 in the wild and no public exploit code.
Other vulnerabilities in Qnap Qts
Sources
Also known as GHSA-4cjq-q46g-r27r.