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
- —
- 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.
Summary
In etcd before versions 3.3.23 and 3.4.10, a large slice causes panic in decodeRecord method. The size of a record is stored in the length field of a WAL file and no additional validation is done on this data. Therefore, it is possible to forge an extremely large frame size that can unintentionally panic at the expense of any RAFT participant trying to decode the WAL.
Why it matters now
EPSS 0.01256 69th percentileScored 2026-11-08
Fix Partial etcd (etcd-io): 3.3.23, 3.4.10go.etcd.io/etcd (Go): 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4Red 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 (Go) | before 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4 | 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4 | Patch available | GHSA-p4g4-wgrh-qrg2 |
- 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 (Go) Vendor— Affected before 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4 Fixed in 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4 Patch available GHSA-p4g4-wgrh-qrg2
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-p4g4-wgrh-qrg2 go.etcd.io/etcd (Go) Fixed in 0.5.0-alpha.5.0.20200423152442-f4b650b51dc4 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-2020-15106
- 2026-10-03 Alias added: GHSA-p4g4-wgrh-qrg2
References
Advisory 3
Other 7
- https://github.com/etcd-io/etcd/pull/11793
- https://github.com/etcd-io/etcd/commit/4571e528f49625d3de3170f219a45c3b3d38c675
- 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-2020-15106 · CVE Program
- CVE-2020-15106 · NVD
- FIRST EPSS
- GHSA-p4g4-wgrh-qrg2 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-15106 · 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