# CVE-2020-13941: Improper Input Validation in Apache Solr


- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 17 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-solr-2020-13941, DEBIAN-CVE-2020-13941, GHSA-2467-h365-j7hm, UBUNTU-CVE-2020-13941

## What is CVE-2020-13941?

CVE-2020-13941 is a high-severity vulnerability in Apache Solr, published on 17 Aug 2020. 

### Official description

Reported in SOLR-14515 (private) and fixed in SOLR-14561 (public), released in Solr version 8.6.0. The Replication handler (https://lucene.apache.org/solr/guide/8_6/index-replication.html#http-api-commands-for-the-replicationhandler) allows commands backup, restore and deleteBackup. Each of these take a location parameter, which was not validated, i.e you could read/write to any location the solr user can access.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-13941?

3 open source packages ship an affected version, including org.apache.solr:solr-parent and solr. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.solr:solr-parent` | Maven | All versions | 8.6.0 |
| `org.apache.solr:solr-parent` | Maven | All versions | 8.6.0 |
| `solr` | Bitnami | All versions | 8.6.0 |

Products: Apache Solr.

## How do I fix CVE-2020-13941?

Upgrade org.apache.solr:solr-parent to 8.6.0 or later.

## Is CVE-2020-13941 being exploited?

There is no known exploitation of CVE-2020-13941 in the wild and no public exploit code.

Public exploit code:

- CVE-2020-13941: Abusing UNC Paths in Windows Environments in Apache Solr (github_poc): https://github.com/mbadanoiu/CVE-2020-13941

## Other vulnerabilities in Apache Solr

- [CVE-2019-17558](https://insights.sbomify.com/CVE-2019-17558/): Apache Solr VelocityResponseWriter Plug-In Remote Code Execution (high 7.5, exploited in the wild)
- [CVE-2019-0193](https://insights.sbomify.com/CVE-2019-0193/): Apache Solr DataImportHandler Code Injection (high 7.2, exploited in the wild)
- [CVE-2024-45216](https://insights.sbomify.com/CVE-2024-45216/): Apache Solr: Authentication bypass possible using a fake URL Path ending (critical 9.8)
- [CVE-2021-44548](https://insights.sbomify.com/CVE-2021-44548/): Apache Solr information disclosure vulnerability through DataImportHandler (critical 9.8)
- [CVE-2021-27905](https://insights.sbomify.com/CVE-2021-27905/): SSRF vulnerability with the Replication handler (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13941 and fix it if it is affected.

What it is: CVE-2020-13941 is a high-severity vulnerability in Apache Solr, published on 17 Aug 2020. 
Exploitation: There is no known exploitation of CVE-2020-13941 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.solr:solr-parent (Maven): affected all versions; fixed in 8.6.0
- org.apache.solr:solr-parent (Maven): affected all versions; fixed in 8.6.0
- solr (Bitnami): affected all versions; fixed in 8.6.0

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-2020-13941/ (Markdown: https://insights.sbomify.com/CVE-2020-13941/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13941
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13941
- OSV: https://osv.dev/vulnerability/CVE-2020-13941

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13941/
Summaries are generated and may contain mistakes; the official description above is the record.