What is CVE-2016-1000221?

CVE-2016-1000221 is a high-severity vulnerability in Elastic Logstash, classified under Information Disclosure. CVSS score: 7.5/10. Published 2017-06-16.

How severe is CVE-2016-1000221?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Elastic Logstash

CVE-2016-1000221

Logstash prior to version 2.3.4, Elasticsearch Output plugin would log to file HTTP authorization headers which could contain sensitive information.

Vulnerability class: Information Disclosure

Published 2017-06-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Elastic Logstash

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.securityfocus.com/bid/99126 (VDB Entry, Third Party Advisory, vdb-entry)
www.elastic.co/community/security (Vendor Advisory)

Frequently asked questions

What is CVE-2016-1000221?: CVE-2016-1000221 is a high-severity vulnerability in Elastic Logstash, classified under Information Disclosure. CVSS score: 7.5/10. Published 2017-06-16.
How severe is CVE-2016-1000221?: High severity. CVSS v3 base score is 7.5 out of 10.