🛡️ CVE-2020-15136 — etcd

⚪ Unknown ✅ No Known Exploit CWE-287 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records

Vulnerability type

Cryptography

Workarounds

Refer to the [gateway documentation](https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md). The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation.

Detail

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. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward.

References

Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf)

For more information

If you have any questions or comments about this advisory:

  • Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability none.

Weakness class

CVE-2020-15136 is classified as CWE-287: Improper Authentication. The identity of the caller is not established correctly, so an attacker can act as another user.

Affected software

CVE-2020-15136 is recorded against 1 package.

  • go.etcd.io/etcd

Timeline and source

Published on 31 January 2024 and last revised on 14 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
lists.fedoraproject.org (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE CWE-287
Public Exploit ✅ No
Source OSV
Published 2024-01-31
Updated 2026-08-12
Modified 2026-03-14
Fix URL N/A

Affected Packages

Software From version Fixed in
go.etcd.io/etcd — —

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