Summary iPlain-English security verdict for QTS, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
QTS currently scores 20/100 — critical, with active exploitation. 3 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2018-19949. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
Disclosure trend iNew CVEs published for QTS each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
3 of its known vulnerabilities are linked to ransomware campaigns (CISA KEV).
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
Most urgent first — actively exploited, then likeliest to be exploited.
CVE-2018-19949 CRITICAL exploited ransomware Improper input validation EPSS 24% → fixed in 4.4.2.1231 CVE-2018-19953 MEDIUM exploited ransomware Cross-site scripting (XSS) EPSS 24% → fixed in 4.4.2.1231 CVE-2018-19943 HIGH exploited ransomware Cross-site scripting (XSS) EPSS 18% → fixed in 4.4.2.1270 CVE-2025-66276 CRITICAL EPSS 0% → fixed in 5.2.7.3256Get alerted about QTS
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Frequently asked
Is QTS safe and patched?
QTS currently scores 20/100 — critical, with active exploitation. 3 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2018-19949. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
What should I do about QTS now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against QNAP's official advisory. Some issues are under active exploitation, so treat this as urgent.
Why is QTS listed on IsItPatched?
QTS was added automatically because CISA's Known Exploited Vulnerabilities (KEV) catalog flagged it as actively exploited in the wild. IsItPatched tracks its known CVEs, severity (CVSS), exploitation probability (EPSS) and KEV status from public data; its version and lifecycle mapping is verified over time.
lifecycle unknown — needs latest supported version
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against QNAP's official advisory before you patch or upgrade.