Read the docs
TI-2021-05128 Aliases CVE-2021-22138GHSA-56cm-rmmq-hqpv

Improper certificate validation in Elasticsearch

Priority LOW 18CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-295.

Summary

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.

Why it matters now

EPSS 0.00459 40th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ElasticElasticsearchafter 6.4.0 and before 6.8.15 and 7.12.0—No fix listedCNA
  • Elasticsearch VendorElastic Affected after 6.4.0 and before 6.8.15 and 7.12.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*6.4.0 to before 6.8.15; 7.0.0 to before 7.12.0VulnerableElastic
  • cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:* Versions 6.4.0 to before 6.8.15; 7.0.0 to before 7.12.0 Vulnerable ·Elastic

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-22138
  2. 2026-10-03 Alias added: GHSA-56cm-rmmq-hqpv

References

Advisory 2

  • TI-2019-05366 Information disclosure through error messages in Elastic Logstash CVSS 3.1CRITICAL 9.8
  • TI-2026-25862 Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write CVSS 3.1CRITICAL 9.8
  • TI-2014-03539 Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to… CVSS 2.0HIGH 7.5
  • TI-2015-04531 Logstash 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allows remote attackers to read… CVSS 3.0HIGH 7.5
  • TI-2019-05374 Uncontrolled resource consumption in Elastic Logstash CVSS 3.1HIGH 7.5
  • TI-2023-25173 Logstash Insertion of Sensitive Information into Log File CVSS 3.1HIGH 8.4
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences