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Fencer Vulns
medium 6.5

CVE-2020-15112 json

Improper Input Validation in etcd

published 2020-08-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2022-7121

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

In etcd before versions 3.3.23 and 3.4.10, it is possible to have an entry index greater then the number of entries in the ReadAll method in wal/wal.go. This could cause issues when WAL entries are being read during consensus as an arbitrary etcd consensus participant could go down from a runtime panic when reading the entry.

Patch / fix

  • etcd etcd 3.3.23, 3.4.10
  • etcd Debian 14, Debian 13, Debian 12 3.3.25+dfsg-5

debian advisories DEBIAN-CVE-2020-15112

  • etcd Ubuntu 20.04 LTS 3.2.26+dfsg-6ubuntu0.1
  • etcd Ubuntu Pro 18.04 LTS 3.2.17+dfsg-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-15112

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • etcd RHEL 7 EXTRAS_OTHER 3.2.32-1.el7_9
  • etcd openstack 16.1 3.3.23-1.el8ost

red hat advisories RHSA-2021:1407RHSA-2021:0916

  • etcd openSUSE Leap 15.6, openSUSE Leap 15.5 3.5.12-150000.7.6.1
  • kubernetes SLE Module for Containers 15 SP1 1.17.13-4.21.2

suse advisories SUSE-SU-2024:3656-1SUSE-SU-2020:3760-1

  • etcd CBL-Mariner 2.0 3.5.0-3

azure linux advisories AZL-6389

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

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-2020-15112 updated cvss 6.5

etcd: DoS in wal/wal.go

  • 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 Enterprise Linux 7 Extras etcd 3.2.32-1.el7_9
    fixed: vendor fix RHSA-2021:1407
  • 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

1.26% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • etcd-io etcd

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-129 Improper Validation of Array Index

References

Sources

Fencer Vulns 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.