How severe is CVE-2016-1000221?

CVE-2016-1000221 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-1000221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1000221?

CVE-2016-1000221 affects Elastic Logstash. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-1000221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-1000221 published?

CVE-2016-1000221 was published on 2017-06-16 and last updated on 2026-06-17.

CVE-2016-1000221

CVE-2016-1000221 is a high-severity vulnerability in Elastic Logstash with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Elastic Logstash
Published: 2017-06-16
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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.
How severe is CVE-2016-1000221?: CVE-2016-1000221 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-1000221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1000221?: CVE-2016-1000221 affects Elastic Logstash. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-1000221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-1000221 published?: CVE-2016-1000221 was published on 2017-06-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*

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