What’s Vulnerable › Vulnerabilities

CVE-2018-17194

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-12-19 · updated 2026-06-17
• Weakness: CWE-20

Description

When a client request to a cluster node was replicated to other nodes in the cluster for verification, the Content-Length was forwarded. On a DELETE request, the body was ignored, but if the initial request had a Content-Length value other than 0, the receiving nodes would wait for the body and eventually timeout. Mitigation: The fix to check DELETE requests and overwrite non-zero Content-Length header values was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.

Affected products

• Apache Software Foundation Apache NiFi: from 1.0.0 through 1.7.1

References

• https://nifi.apache.org/security.html#CVE-2018-17194
• https://nifi.apache.org/security.html#CVE-2018-17194

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