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    CVE-2018-16886

    etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.

    Published:Jan 11, 2019
    Last Modified:Nov 21, 2024
    EPS:Jan 14, 2019
    EPSS Score:0.00738
    CVSS Score:8.1

    Affected Products

    Vendor
    Etcd
    Product
    Etcd
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation
    Vendor
    Redhat
    Product
    Rhel Extras Other

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-73500 (CVSS 8.7) — etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, …
    CVE-2026-73499 (CVSS 7.1) — etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, …
    CVE-2026-59818 (CVSS 6.5) — etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when e…
    CVE-2026-44283 (CVSS 0) — etcd is a distributed key-value store for the data of a distributed system. Prior to 3.4.44, 3.5.30, and 3.6.1…
    CVE-2026-33413 (CVSS 8.8) — etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, …
    CVE-2026-33343 (CVSS 0) — etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, …
    CVE-2022-34038 (CVSS 7.5) — Etcd v3.5.4 allows remote attackers to cause a denial of service via function PageWriter.write in pagewriter.g…
    CVE-2023-32082 (CVSS 3.1) — etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.26 and 3.5.9…
    CVE-2021-28235 (CVSS 9.8) — Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the …
    CVE-2020-15112 (CVSS 6.5) — In etcd before versions 3.3.23 and 3.4.10, it is possible to have an entry index greater then the number of en…

    References

    http://www.securityfocus.com/bid/106540
    https://access.redhat.com/errata/RHSA-2019:0237
    https://access.redhat.com/errata/RHSA-2019:1352
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
    https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
    https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/
    http://www.securityfocus.com/bid/106540
    https://access.redhat.com/errata/RHSA-2019:0237
    https://access.redhat.com/errata/RHSA-2019:1352
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
    https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
    https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/

    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