# Ruby Openssl Allows Incorrect Value Comparison

Advisory record · `GHSA-mmrq-6999-72v8`

- **Identifiers:** `GHSA-mmrq-6999-72v8` · `CVE-2018-16395`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+, CVSS 7+ and EPSS
- **Published:** 13 May 2022
- **Updated:** 3 Dec 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 13 May 2022, 01:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.
- CVSS score 9.8 (7.0 or more) and EPSS 0.11 (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

- `openssl` (RubyGems): affected `<2.0.9 || >=2.1.0, <2.1.2`; fixed in `2.0.9`, `2.1.2`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.11, the 95th percentile, on 8 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 13 May 2022. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-mmrq-6999-72v8](https://github.com/advisories/GHSA-mmrq-6999-72v8)
- [OSV: GHSA-mmrq-6999-72v8](https://osv.dev/vulnerability/GHSA-mmrq-6999-72v8)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-16395>
- <https://github.com/ruby/openssl/commit/f653cfa43f0f20e8c440122ea982382b6228e7f5>
- <https://hackerone.com/reports/387250>
- <https://www.ruby-lang.org/en/news/2018/11/06/ruby-2-6-0-preview3-released>
- <https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released>
- <https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-4-5-released>
- <https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-3-8-released>
- <https://www.ruby-lang.org/en/news/2018/10/17/openssl-x509-name-equality-check-does-not-work-correctly-cve-2018-16395>
- <https://www.oracle.com/security-alerts/cpujan2020.html>
- <https://www.debian.org/security/2018/dsa-4332>
- <https://web.archive.org/web/20211206015239/https://securitytracker.com/id/1042105>
- <https://usn.ubuntu.com/3808-1>

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-mmrq-6999-72v8>, 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-mmrq-6999-72v8/>. Everything for agents: <https://agentprime.io/llms.txt>.