CVE-2018-19943
QNAP NAS File Station Cross-Site Scripting Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 22.68% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 24 May 2022 · due 14 June 2022 · used in ransomware campaigns
- Weakness
- CWE-79, CWE-80
- Affected
- qnap/qts
- Source
- security@qnapsecurity.com.tw
EPSS moved from 21.5% on 24 September 2026 to 22.7% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2018-19943
References
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19943US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.