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Fencer Intel
medium 6.5

CVE-2020-15136 json

Improper authentication in etcd

published 6y ago modified last mo. also GHSA-wr2v-9rpq-c35q , EUVD-2024-0452

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. This has been fixed in versions 3.4.10 and 3.3.23 with improved documentation and deprecation of the functionality.

Patch / fix

  • go go.etcd.io/etcd 3.3.23, 3.4.10
  • redhat etcd 3.3.23, 3.4.10
  • etcd Debian 14, Debian 13, Debian 12 3.3.25+dfsg-5

debian advisories DEBIAN-CVE-2020-15136

  • etcd openstack 16.1 3.3.23-1.el8ost

red hat advisories RHSA-2021:0916

  • etcd CBL-Mariner 2.0 3.5.0-3

azure linux advisories AZL-6393

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15136 updated cvss 6.5

etcd: no authentication is performed against endpoints provided in the --endpoints flag

  • Red Hat Enterprise Linux 7 etcd
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 15 (Stein) etcd
    affected: no fix available “Fix deferred”
  • Red Hat Storage 3 etcd
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4.8 openshift4/ose-etcd v4.8.0-202106152230.p0.git.aefa6bf.assembly.stream
    fixed: vendor fix RHSA-2021:2438
  • Red Hat OpenStack Platform 16.1 etcd 3.3.23-1.el8ost
    fixed: vendor fix RHSA-2021:0916
  • Red Hat Advanced Cluster Management for Kubernetes 2 etcd Red Hat OpenShift Container Platform 4.8 openshift4/ose-cli v4.8.0-202106291725.p0.git.1077b05.assembly.stream, openshift4/ose-pod v4.8.0-202107161820.p0.git.051ac4f.assembly.stream, openshift4/ose-tests v4.8.0-202107131424.p0.git.0d958c3.assembly.stream, openshift4/ose-console v4.8.0-202107010336.p0.git.188a490.assembly.stream, openshift4/ose-coredns v4.8.0-202106291913.p0.git.642b46e.assembly.stream, openshift4/ose-grafana v4.8.0-202106291913.p0.git.b987e4b.assembly.stream, +135 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.65% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
go go.etcd.io/etcd
>=3.4.0-rc.0, <3.4.10
<3.3.23
3.4.10
3.3.23

Affected products

  • etcd-io etcd

Classification

Weakness
  • CWE-287 Improper Authentication
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.