# CVE-2017-20284: Caucho Resin resin-doc Unauthenticated Path Traversal via jndi-appconfig Servlet

> Remote unauthenticated attackers can read arbitrary files on the server via path traversal in the Resin documentation webapp.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 27 Oct 2026
- **Also known as:** GHSA-x46g-q89h-7xg3

## What is CVE-2017-20284?

CVE-2017-20284 is a high-severity path traversal vulnerability in Caucho Technology, Inc. Resin, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Caucho Resin contains a path traversal vulnerability in the documentation webapp (resin-doc) that allows remote unauthenticated attackers to read arbitrary files by supplying a relative path through the inputFile request parameter of the jndi-appconfig tutorial servlet. Attackers can craft requests with directory traversal sequences to the servlet endpoint to read files outside the intended tutorial directory on the underlying system. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-12-10.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2017-20284?


## How do I fix CVE-2017-20284?

No fix has been published for CVE-2017-20284 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-20284 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20284 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-20284 and fix it if it is affected.

What it is: CVE-2017-20284 is a high-severity path traversal vulnerability in Caucho Technology, Inc. Resin, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20284 exists.

Affected product: Caucho Technology, Inc. Resin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2017-20284/ (Markdown: https://insights.sbomify.com/CVE-2017-20284/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-20284
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-20284
- OSV: https://osv.dev/vulnerability/CVE-2017-20284

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-20284/
Summaries are generated and may contain mistakes; the official description above is the record.