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HIGH severity

CVE-2020-9486 — nifi-stateless

HIGHFix: apache/nifi@148537d

CVE-2020-9486 is a high-severity (CVSS 7.5) CWE-532 vulnerability in org.apache.nifi:nifi-stateless. A fix is available for org.apache.nifi:nifi-stateless — see the affected versions and patch details below.

Insertion of Sensitive Information into Log File in Apache NiFi Stateless

Also known asBIT-nifi-2020-9486GHSA-g644-pr5v-vppf
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
0.57%1.80%3.02%4.25%1.3%1.3%3.6%3.6%3.6%May 26Jul 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-9486 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕org.apache.nifi:nifi-stateless

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

In Apache NiFi 1.10.0 to 1.11.4, the NiFi stateless execution engine produced log output which included sensitive property values. When a flow was triggered, the flow definition configuration JSON was printed, potentially containing sensitive values in plaintext.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.nifi:nifi-stateless≥ 1.10.0&&< 1.12.0-RC11.12.0-RC1org.apache.nifi:nifi-stateless:1.12.0-RC1

Affected Products

1 product · 1 configurations
Application
nifiapache
≥ 1.0.0 && ≤ 1.11.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.nifi:nifi-stateless, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.nifi:nifi-stateless to 1.12.0-RC1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-9486 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

In Apache NiFi 1.10.0 to 1.11.4, the NiFi stateless execution engine produced log output which included sensitive property values. When a flow was triggered, the flow definition configuration JSON was printed, potentially containing sensitive values in plaintext.
O3 Security · Impact-Aware SCA

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CVE-2020-9486: nifi-stateless — Fixed in 1.12.0-RC1