# CVE-2021-28163: Directory exposure in jetty

> Attackers can read sensitive files if the webapps directory is a symlink, exposing deployed applications and directory contents.

- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** BIT-solr-2021-28163, DEBIAN-CVE-2021-28163, GHSA-j6qj-j888-vvgq, UBUNTU-CVE-2021-28163

## What is CVE-2021-28163?

CVE-2021-28163 is a low-severity path traversal vulnerability in Eclipse Jetty, published on 1 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

In Eclipse Jetty 9.4.32 to 9.4.38, 10.0.0.beta2 to 10.0.1, and 11.0.0.beta2 to 11.0.1, if a user uses a webapps directory that is a symlink, the contents of the webapps directory is deployed as a static webapp, inadvertently serving the webapps themselves and anything else that might be in that directory.

Weakness: CWE-59 (Improper Link Resolution Before File Access), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2021-28163?

7 open source packages ship an affected version, including org.eclipse.jetty:jetty-deploy and solr. It affects 23 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 10.0.0 | 10.0.2 |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 10.0.0 | 10.0.2 |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 11.0.0 | 11.0.2 |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 11.0.0 | 11.0.2 |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 9.4.32 | 9.4.39 |
| `org.eclipse.jetty:jetty-deploy` | Maven | From 9.4.32 | 9.4.39 |
| `solr` | Bitnami | From 8.8.1 | 8.8.2 |

Products: Apache Ignite, Apache Solr, Eclipse Jetty, Fedoraproject Fedora, Netapp Cloud Manager, Netapp E-Series Performance Analyzer, Netapp E-Series Santricity Os Controller, Netapp E-Series Santricity Web Services, Netapp Element Plug-in for Vcenter Server, Netapp Santricity Cloud Connector, Netapp Snapcenter, Netapp Snapcenter Plug-In, Netapp Storage Replication Adapter for Clustered Data Ontap, Netapp Vasa Provider for Clustered Data Ontap, Netapp Virtual Storage Console, Oracle Autovue for Agile Product Lifecycle Management, Oracle Banking Apis, Oracle Banking Digital Experience, Oracle Communications Element Manager, Oracle Communications Services Gatekeeper and 3 more.

## How do I fix CVE-2021-28163?

Upgrade org.eclipse.jetty:jetty-deploy to a fixed version for your release line: 10.0.2, 11.0.2 or 9.4.39.

## Is CVE-2021-28163 being exploited?

There is no known exploitation of CVE-2021-28163 in the wild and no public exploit code.

## Other vulnerabilities in Eclipse Jetty

- [CVE-2018-1273](https://insights.sbomify.com/CVE-2018-1273/): VMware Tanzu Spring Data Commons Property Binder (critical 9.8, exploited in the wild)
- [CVE-2018-8018](https://insights.sbomify.com/CVE-2018-8018/): Code execution via deserialization in org.apache.ignite:ignite-core (critical 9.8)
- [CVE-2018-1295](https://insights.sbomify.com/CVE-2018-1295/): Apache serialization mechanism does not have a list of classes allowed for serialization/deserialization (critical 9.8)
- [CVE-2024-52577](https://insights.sbomify.com/CVE-2024-52577/): Apache Ignite: Possible RCE when deserializing incoming messages by the server node (critical 9.5)
- [CVE-2020-1963](https://insights.sbomify.com/CVE-2020-1963/): File system access via H2 in Apache Ignite (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-28163 and fix it if it is affected.

What it is: CVE-2021-28163 is a low-severity path traversal vulnerability in Eclipse Jetty, published on 1 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-28163 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.eclipse.jetty:jetty-deploy (Maven): affected from 10.0.0; fixed in 10.0.2
- org.eclipse.jetty:jetty-deploy (Maven): affected from 10.0.0; fixed in 10.0.2
- org.eclipse.jetty:jetty-deploy (Maven): affected from 11.0.0; fixed in 11.0.2
- org.eclipse.jetty:jetty-deploy (Maven): affected from 11.0.0; fixed in 11.0.2
- org.eclipse.jetty:jetty-deploy (Maven): affected from 9.4.32; fixed in 9.4.39
- org.eclipse.jetty:jetty-deploy (Maven): affected from 9.4.32; fixed in 9.4.39
- solr (Bitnami): affected from 8.8.1; fixed in 8.8.2

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-2021-28163/ (Markdown: https://insights.sbomify.com/CVE-2021-28163/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-28163
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-28163
- OSV: https://osv.dev/vulnerability/CVE-2021-28163

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-28163/
Summaries are generated and may contain mistakes; the official description above is the record.