CVE-2018-19945: QNAP QTS

Critical severity, CVSS 9.1. EPSS: 1.1% chance of exploitation in the next 30 days.

A vulnerability has been reported to affect earlier QNAP devices running QTS 4.3.4 to 4.3.6. Caused by improper limitations of a pathname to a restricted directory, this vulnerability allows for renaming arbitrary files on the target system, if exploited. QNAP have already fixed this vulnerability in the following versions: QTS 4.3.6.0895 build 20190328 (and later) QTS 4.3.4.0899 build 20190322 (and later) This issue does not affect QTS 4.4.x or QTS 4.5.x.

Affected products

• QNAP QTS: from 4.3.4, before 4.3.4.0899 (fixed in 4.3.4.0899); from 4.3.5, before 4.3.6.0895 (fixed in 4.3.6.0895)

Published 2020-12-31. Last modified 2026-06-17.