CVE-2021-22138

mediumpriority · track · 15EPSS 0.005 · 40 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.46% (40th) EPSS

CVSS 4.3 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

In Logstash versions after 6.4.0 and before 6.8.15 and 7.12.0 a TLS certificate validation flaw was found in the monitoring feature. When specifying a trusted server CA certificate Logstash would not properly verify the certificate returned by the monitoring server. This could result in a man in the middle style attack against the Logstash monitoring data.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.4–4.3

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 1.4

v3.13.4lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295USprimary

affected products (5)

Products and version ranges known to be affected.

Elastic Elasticsearch≤ after 6.4.0 and before 6.8.15 and 7.12.0enisa_euvdEU
elastic logstash6.4.0 → 6.8.15nvdUScpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*
elastic logstash7.0.0 → 7.12.0nvdUScpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*
Bitnami logstash6.4.0 → 6.8.15osvUSpkg:bitnami/logstash
Bitnami logstash7.0.0 → 7.12.0osvUSpkg:bitnami/logstash

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-logstash-2021-221382024-03-06vendor · osvUS
In Logstash versions after 6.4.0 and before 6.8.15 and 7.12.0 a TLS certificate validation flaw was found in the monitoring feature. When specifying a trusted server CA certificate Logstash would not properly verify the certificate returned by the monitoring server. This could result in a man in the middle style attack against the Logstash monitoring data.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-05-13modified 2026-06-17

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+1891 more

references (7)

External citations — patches, advisories, analysis.

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