CVE-2020-15136

Improper authentication in etcd

MEDIUM

6.5

CVSS Score

Published: August 6, 2020 at 10:45 PM UTC

Updated: June 17, 2026 at 02:56 AM UTC

3 products affected across 3 vendorsFedoraEtcdEtcd

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Severity

MEDIUM6.5

Exploit prediction

EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora · Fedora Projectrpm

95%

Etcd · Red Hat

95%

3.3.0 ≤ v < 3.3.233.4.0 ≤ v < 3.4.10

Affected range stops below 3.3.23, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.10, so it looks safe — our inference, not a vendor statement

Etcd · Etcd Io

60%

v < 3.3.23v < 3.4.10

Affected range stops below 3.3.23, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.4.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/

References (3)

x_refsource_MISCBroken Link

Source: [email protected]

https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q

Vendor Advisoryx_refsource_FEDORA

Source: [email protected]

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-287CWE-306

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