CVE-2025-66277 QTS, QuTS hero
Remote attackers can exploit a link following vulnerability to traverse the file system and access unintended locations on QNAP NAS devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66277?
CVE-2025-66277 is a critical path traversal vulnerability in Qnap Qts, published on 11 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.
We have already fixed the vulnerability in the following versions: QTS 5.2.8.3350 build 20251216 and later QuTS hero h5.3.2.3354 build 20251225 and later QuTS hero h5.2.8.3350 build 20251216 and later
Weakness: CWE-59
Which versions are affected by CVE-2025-66277?
It affects 2 products.
Products include Qnap Qts, Qnap Quts Hero.
How do I fix CVE-2025-66277?
No fix has been published for CVE-2025-66277 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-66277 being exploited?
There is no known exploitation of CVE-2025-66277 in the wild and no public exploit code.
Other vulnerabilities in Qnap Qts
Sources
Also known as GHSA-3wh2-2wc5-f45w.