# Apache Tomcat affected by vulnerability in TLS and SSL protocol

Advisory record · `GHSA-f7w7-6pjc-wwm6`

- **Identifiers:** `GHSA-f7w7-6pjc-wwm6` · `CVE-2009-3555`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+, CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-295](https://cwe.mitre.org/data/definitions/295.html) · [CWE-300](https://cwe.mitre.org/data/definitions/300.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md) · [CWE-300](https://agentprime.io/advisories/tag/cwe-300.md)
- **Published:** 2 May 2022
- **Updated:** 9 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 2 May 2022, 03:46 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 0.87 (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

- `org.apache.tomcat:tomcat` (Maven): affected `>=7.0.0, <7.0.10 || >=6.0.0, <6.0.32 || >=5.0.0, <5.5.33`; fixed in `7.0.10`, `6.0.32`, `5.5.33`

## Machine-written summary

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

> Apache Tomcat versions 5.0.0 through 5.5.32, 6.0.0 through 6.0.31, and 7.0.0 through 7.0.9 are affected by a TLS/SSL renegotiation flaw. A man-in-the-middle attacker on the network can insert data into HTTPS sessions by sending an unauthenticated request that the server processes in a post-renegotiation context. Upgrade to Tomcat 7.0.10, 6.0.32, or 5.5.33 or later.

Written 3 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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/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:** 0.87, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-f7w7-6pjc-wwm6)

## Sources

- [GitHub Advisory Database: GHSA-f7w7-6pjc-wwm6](https://github.com/advisories/GHSA-f7w7-6pjc-wwm6)
- [OSV: GHSA-f7w7-6pjc-wwm6](https://osv.dev/vulnerability/GHSA-f7w7-6pjc-wwm6)
- <https://nvd.nist.gov/vuln/detail/CVE-2009-3555>
- <https://github.com/apache/tomcat/commit/df9633116b5fec8f47f1f008fb89a6e9d5895cd0>
- <https://github.com/apache/tomcat/commit/b4e9488629bf03b4b65abf335e536e85386d1366>
- <https://github.com/apache/tomcat/commit/56f67141e82e16f68a860c3af9b7342da35cbe7d>
- <https://github.com/apache/tomcat/commit/3d315ac9dfaa2c03b4df82938d78bf5b755766b3>
- <https://github.com/apache/tomcat/commit/328a523cbb2a2d4cd55283180614d4e03e2f8f02>
- <https://github.com/apache/tomcat/commit/30af3f5630542a2340781f66553e734a6fd69701>
- <https://github.com/apache/tomcat/commit/2d4ca03acc27cc883c404d1745d92f983b6fada3>
- <https://github.com/apache/tomcat/commit/14e4efd925da58b9fa63f20969fb7349b8a9c30d>
- <https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8535>
- <https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8366>
- <https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7973>

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-f7w7-6pjc-wwm6>, 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-f7w7-6pjc-wwm6/>. Everything for agents: <https://agentprime.io/llms.txt>.