Improper Input Validation in etcd
Priority LOW 31CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-129 and the CVSS impact.
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.
Why it matters now
EPSS 0.01256 69th percentileScored 2026-11-07
Fix Partial etcd (etcd-io): 3.3.23, 3.4.10go.etcd.io/etcd/v3 (Go): 3.3.23, 3.4.10Red Hat: 3 advisoriesRed Hat: 3 fixed, 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| etcd-io | etcd | before 3.3.23; before 3.4.10 | 3.3.23, 3.4.10 | Patch available | CNA |
| — | go.etcd.io/etcd/v3 (Go) | before 3.3.23 | 3.3.23 | Patch available | GHSA-m332-53r6-2w93 |
| — | go.etcd.io/etcd/v3 (Go) | 3.4.0 to before 3.4.10 | 3.4.10 | Patch available | GHSA-m332-53r6-2w93 |
- etcd Vendoretcd-io Affected before 3.3.23; before 3.4.10 Fixed in 3.3.23, 3.4.10 Patch available CNA
- go.etcd.io/etcd/v3 (Go) Vendor— Affected before 3.3.23 Fixed in 3.3.23 Patch available GHSA-m332-53r6-2w93
- go.etcd.io/etcd/v3 (Go) Vendor— Affected 3.4.0 to before 3.4.10 Fixed in 3.4.10 Patch available GHSA-m332-53r6-2w93
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* | before 3.3.23; 3.4.0 to before 3.4.10 | Vulnerable | etcd-io |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
- cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:* Versions before 3.3.23; 3.4.0 to before 3.4.10 Vulnerable ·etcd-io
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
Remediation
- Fix · CNA etcd (etcd-io) Fixed in 3.3.23, 3.4.10
- Fix · GHSA-m332-53r6-2w93 go.etcd.io/etcd/v3 (Go) Fixed in 3.3.23 Advisory →
- Fix · GHSA-m332-53r6-2w93 go.etcd.io/etcd/v3 (Go) Fixed in 3.4.10 Advisory →
Red Hat 3 advisories
- RHSA-2021:2438 Released 2021-07-27 · Red Hat rating ModerateOpenShift Container Platform 4.8.2 bug fix and security update
- Red Hat OpenShift Container Platform 4.8 openshift4/driver-toolkit-rhel8, openshift4/egress-router-cni-rhel8, openshift4/network-tools-rhel8 +47
- RHSA-2021:1407 Released 2021-04-27 · Red Hat rating Moderateetcd security update
- Red Hat Enterprise Linux 7 Extras etcd-3.2.32-1.el7_9
- RHSA-2021:0916 Released 2021-03-17 · Red Hat rating ModerateRed Hat OpenStack Platform 16.1.4 (etcd) security update
- Red Hat OpenStack Platform 16.1 etcd-3.3.23-1.el8ost
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
etcd-io etcd — FEDORA-2020-cd43b84c16
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2020-11890 No minimum password length in etcdPriority LOW 36
- TI-2020-11889 Denial of Service in etcdPriority LOW 36
- TI-2020-11909 Improper authentication in etcdPriority LOW 32
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenStack Platform 15 (Stein) | Affected | No fix yet: Fix deferred |
| Red Hat Storage 3 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 Extras | Fixed | RHSA-2021:1407 |
| Red Hat OpenShift Container Platform 4.8 | Fixed | RHSA-2021:2438 |
| Red Hat OpenStack Platform 16.1 | Fixed | RHSA-2021:0916 |
Not affected: 2 products
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat OpenShift Container Platform 4.8
Timeline
- 2026-10-02 Threatist record created from CVE-2020-15112
- 2026-10-03 Alias added: GHSA-m332-53r6-2w93
References
Advisory 3
Other 7
- https://github.com/etcd-io/etcd/pull/11793
- https://github.com/etcd-io/etcd/commit/7d1cf640497cbcdfb932e619b13624112c7e3865
- https://github.com/etcd-io/etcd/commit/f4b650b51dc4a53a8700700dc12e1242ac56ba07
- https://github.com/etcd-io/etcd
- https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf
- https://lists.fedoraproject.org/archives/list/[email protected]/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP
- https://pkg.go.dev/vuln/GO-2020-0005
More etcd-io Etcd vulnerabilities
- TI-2021-09444 Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to… CVSS 3.1CRITICAL 9.8
- TI-2026-25810 etcd: Authorization bypasses in multiple APIs CVSS 4.0HIGH 8.8
- TI-2022-15016 Etcd v3.5.4 allows remote attackers to cause a denial of service via function… CVSS 3.1HIGH 7.5
- TI-2018-12096 Improper authentication in etcd: CVSS 3.1HIGH 8.1
- TI-2026-42635 etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation CVSS 3.1HIGH 8.1
- TI-2026-25749 etcd: Nested etcd transactions bypass RBAC authorization checks CVSS 3.1MEDIUM 6.5
Sources
- CVE-2020-15112 · CVE Program
- CVE-2020-15112 · NVD
- FIRST EPSS
- GHSA-m332-53r6-2w93 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-15112 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences