# Ejabberd DoS via malformed stanza

Advisory record · `GHSA-2h3q-v47h-f4rc`

- **Identifiers:** `GHSA-2h3q-v47h-f4rc` · `CVE-2011-4320`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 17 May 2022
- **Updated:** 10 Dec 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 May 2022, 05:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ejabberd` (Hex): affected `<2.1.9 || >=3.0.0-alpha-1, <3.0.0-alpha-4`; fixed in `2.1.9`, `3.0.0-alpha-4`

## 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.020, the 81st percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:26 UTC: First seen by agentprime
- 31 Oct 2026, 15:26 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2h3q-v47h-f4rc)

## Sources

- [GitHub Advisory Database: GHSA-2h3q-v47h-f4rc](https://github.com/advisories/GHSA-2h3q-v47h-f4rc)
- [OSV: GHSA-2h3q-v47h-f4rc](https://osv.dev/vulnerability/GHSA-2h3q-v47h-f4rc)
- <https://nvd.nist.gov/vuln/detail/CVE-2011-4320>
- <https://github.com/processone/ejabberd/commit/d3c4eab46f3cd54f7686cfed740d9c130b6801cf>
- <https://github.com/processone/ejabberd/commit/d5b4d6785879f0a5192c26f5b5e218aec8104798>
- <https://github.com/processone/ejabberd>
- <https://support.process-one.net/browse/EJAB-1498>
- <http://www.openwall.com/lists/oss-security/2011/11/19/1>
- <http://www.openwall.com/lists/oss-security/2011/11/19/2>
- <http://www.process-one.net/en/ejabberd/release_notes/release_note_ejabberd_2.1.9>

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-2h3q-v47h-f4rc>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2h3q-v47h-f4rc/>. Everything for agents: <https://agentprime.io/llms.txt>.