# WEBrick RCE Vulnerability

Advisory record · `GHSA-369m-2gv6-mw28`

- **Identifiers:** `GHSA-369m-2gv6-mw28` · `CVE-2017-10784`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** Yes: CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-287](https://cwe.mitre.org/data/definitions/287.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md)
- **Published:** 14 May 2022
- **Updated:** 13 Mar 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 14 May 2022, 02:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 8.8 (7.0 or more) and EPSS 0.16 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

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

## Affected packages

- `webrick` (RubyGems): affected `<1.4.0`; fixed in `1.4.0`

## 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

- 8.8 High, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.16, the 97th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 14 May 2022. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-369m-2gv6-mw28](https://github.com/advisories/GHSA-369m-2gv6-mw28)
- [OSV: GHSA-369m-2gv6-mw28](https://osv.dev/vulnerability/GHSA-369m-2gv6-mw28)
- <https://nvd.nist.gov/vuln/detail/CVE-2017-10784>
- <https://github.com/ruby/ruby/commit/6617c41292>
- <https://github.com/ruby/webrick/commit/4ac0f3843ab82d1c31e1cfc719409208adef7813>
- <https://hackerone.com/reports/223363>
- <https://www.ruby-lang.org/en/news/2017/09/14/webrick-basic-auth-escape-sequence-injection-cve-2017-10784>
- <https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released>
- <https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released>
- <https://www.debian.org/security/2017/dsa-4031>
- <https://web.archive.org/web/20211025092552/http://www.securitytracker.com/id/1039363>
- <https://web.archive.org/web/20210919031115/http://www.securitytracker.com/id/1042004>
- <https://web.archive.org/web/20210621131814/http://www.securityfocus.com/bid/100853>
- <https://usn.ubuntu.com/3685-1>

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-369m-2gv6-mw28>, 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-369m-2gv6-mw28/>. Everything for agents: <https://agentprime.io/llms.txt>.