Vulnerability · Published Jan 2, 2026 · Assigned by qnap
CVE-2025-53591QTS, QuTS hero
Low 1.2
In plain English
A low-severity security flaw in QTS from QNAP Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).
Official description
A use of externally-controlled format string 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 obtain secret data or modify memory. 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
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| QNAP Systems Inc. | QTS | 5.2.x – before 5.2.7.3256 build 20250913 |
| QNAP Systems Inc. | QuTS hero | h5.3.x – before h5.3.1.3250 build 20250912h5.2.x – before h5.2.7.3256 build 20250913 |
Weakness: CWE-134 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U