CVE-2020-1942Network attack vector

Sensitive-value disclosure via plaintext flow fingerprint logging

Published Feb 11, 2020 · Updated Aug 4, 2024

Information exposure in Apache NiFi 0.0.1 through 1.11.0 allows remote attackers to expose sensitive values through cluster-join errors. The flow fingerprint factory incorporates sensitive property descriptor values into the cluster and local flow fingerprints, then writes both fingerprints to application logs in plaintext when the flows cannot be inherited. The trigger requires a node to attempt to join a cluster with a non-inheritable flow; the resulting log entry exposes those values to parties able to read the logs.

CVSS severity7.5
High
EPSS probability3.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Apache NiFi 0.0.1 through 1.11.0 allows remote attackers to expose sensitive values through cluster-join errors. The flow fingerprint factory incorporates sensitive property descriptor values into the cluster and local flow fingerprints, then writes both fingerprints to application logs in plaintext when the flows cannot be inherited. The trigger requires a node to attempt to join a cluster with a non-inheritable flow; the resulting log entry exposes those values to parties able to read the logs.

The record

CVE
CVE-2020-1942
Published
Feb 11, 2020
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache NiFi
Classifications
CWE-532
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache NiFi 0.0.1 to 1.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache NiFiversion=Apache NiFi 0.0.1 to 1.11.0

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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