Apache NiFi vulnerabilities: known CVEs & security history
Apache · Data / Integration · 5 tracked CVEs · 0 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Apache NiFi release lines — 5 in total. A CVE here doesn't mean your version is affected — check Apache NiFi's current status and the safe version to run.
Known Apache NiFi CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2021-20190 | high | 8.1 | 7% | 2021 |
| CVE-2026-44914 | high | 7.2 | 0% | 2026 |
| CVE-2026-44913 | high | 7.2 | 0% | 2026 |
| CVE-2026-44911 | medium | 6.3 | 0% | 2026 |
| CVE-2026-54665 | medium | 5.3 | 0% | 2026 |
Is my Apache NiFi version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Apache NiFi version → · Monitor Apache NiFi for new CVEs →
Apache NiFi vulnerabilities — frequently asked
How many known vulnerabilities does Apache NiFi have?
IsItPatched tracks 5 CVEs for Apache NiFi. 0 are critical-severity and 3 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Apache NiFi have any actively-exploited vulnerabilities?
None of Apache NiFi's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Apache NiFi vulnerability?
Among tracked issues, CVE-2021-20190 (HIGH, CVSS 8.1) ranks highest — a Insecure deserialization weakness.
Is Apache NiFi safe to use?
It depends on the version. The latest supported Apache NiFi release (2.10.0) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Apache NiFi security status · Apache NiFi end-of-life · actively-exploited CVEs. Always verify against Apache's advisories — see our disclaimer.