# Apache ZooKeeper: Authentication bypass with IP-based authentication in Admin Server

Advisory record · `GHSA-g93m-8x6h-g5gv`

- **Identifiers:** `GHSA-g93m-8x6h-g5gv` · `BIT-zookeeper-2024-51504` · `CVE-2024-51504`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-290](https://cwe.mitre.org/data/definitions/290.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md)
- **Published:** 7 Nov 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Nov 2024, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.1: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.apache.zookeeper:zookeeper` (Maven): affected `>=3.9.0, <3.9.3`; fixed in `3.9.3`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Apache ZooKeeper versions 3.9.0 up to 3.9.3 (not including 3.9.3) are affected when IP-based authentication is used in the Admin Server. The default client IP detection in IPAuthenticationProvider trusts the X-Forwarded-For header, so a remote attacker can spoof an allowed IP address and bypass authentication, then run Admin Server commands such as snapshot and restore. Upgrade to version 3.9.3, which fixes this issue.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0092, the 60th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-g93m-8x6h-g5gv)

## Sources

- [GitHub Advisory Database: GHSA-g93m-8x6h-g5gv](https://github.com/advisories/GHSA-g93m-8x6h-g5gv)
- [OSV: GHSA-g93m-8x6h-g5gv](https://osv.dev/vulnerability/GHSA-g93m-8x6h-g5gv)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-51504>
- <https://github.com/apache/zookeeper/commit/2c2b74c1c11b6531aabb1bf06782e859048d5983>
- <https://github.com/apache/zookeeper>
- <https://lists.apache.org/thread/b3qrmpkto5r6989qr61fw9y2x646kqlh>
- <http://www.openwall.com/lists/oss-security/2024/11/06/5>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-g93m-8x6h-g5gv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-g93m-8x6h-g5gv/>. Everything for agents: <https://agentprime.io/llms.txt>.