CVE-2023-31421

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    CVE-2023-31421

    Published: 26 Oct 2023Last Modified: 28 Oct 2026

    Summary: Beats, Elastic Agent, APM Server, and Fleet Server Improper Certificate Validation issue

    Details: It was discovered that when acting as TLS clients, Beats, Elastic Agent, APM Server, and Fleet Server did not verify whether the server certificate is valid for the target IP address; however, certificate signature validation is still performed. More specifically, when the client is configured to connect to an IP address (instead of a hostname) it does not validate the server certificate's IP SAN values against that IP address and certificate validation fails, and therefore the connection is not blocked as expected.

    References: https://discuss.elastic.co/t/beats-elastic-agent-apm-server-and-fleet-server-8-10-1-security-update-improper-certificate-validation-issue-esa-2023-16/343385, https://www.elastic.co/community/security, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/31xxx/CVE-2023-31421.json, https://nvd.nist.gov/vuln/detail/CVE-2023-31421

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 6afb387ae002e5a8dc2427b53225aa42681e4208
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High