Low severity · published May 13, 2021
CVE-2021-22138
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
3.7
CVSS
0.5%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LO
Logstash · Elastic
6.4.0 before 6.8.15; 7.0.0 before 7.12.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22138
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22138
Vendor Advisory
https://discuss.elastic.co/t/elastic-stack-7-12-0-and-6-8-15-security-update/268125
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210629-0001/
More from Logstash
9.8
CVE-2026-33466
Improper Limitation of a Pathname to a Restricted Directory in Logstash Leading to Arbitrary File Write
9.8
CVE-2019-7612
A sensitive data disclosure flaw was found in the way Logstash versions before 5.6.15 and 6.6.1 logs malformed URLs
7.5
CVE-2019-7620
Logstash versions before 7.4.1 and 6.8.4 contain a denial of service flaw in the Logstash Beats input plugin
7.5
CVE-2015-5378
Logstash 1.5.x before 1.5.3 and 1.4.x before 1.4.4 allows remote attackers to read communications between Logstash Forwarder agent and Logstash server
7.5
CVE-2016-10363
Logstash versions prior to 2.3.3, when using the Netflow Codec plugin, a remote attacker crafting malicious Netflow v5, Netflow v9 or IPFIX packets could perform a denial of…