# CVE-2019-17558: Improper Input Validation in Apache Solr

Source: https://junglewise.ai/threats/cve-2019-17558-apache-solr-velocityresponsewriter-plug-in-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-02-12. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2019-17558 · Severity: critical · CVSS 3.1 · Exploited in the wild · Published 2020-02-12

Apache Solr is vulnerable to Remote Code Execution via the VelocityResponseWriter plug-in. An attacker can trigger execution by providing malicious Velocity templates through a configset directory or by enabling the 'params.resource.loader.enabled' setting via the Configuration API.

Technologies: [Apache Solr](https://junglewise.ai/threats/technologies/solr), [org.apache.solr:solr-core (Maven)](https://junglewise.ai/threats/technologies/org-apache-solr-solr-core). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache), [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2019-17558 exploited in the wild?** Yes. CVE-2019-17558 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2019-17558?** Critical severity, with a CVSS score of 3.1, published 12 February 2020.

**Which products and versions are affected?** org.apache.solr:solr-core (Maven) ECOSYSTEM:introduced=5.0.0,fixed=8.4.0.

**Is there a fix for CVE-2019-17558?** Yes. org.apache.solr:solr-core (Maven): upgrade to 8.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2019-17558 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2019-17558?** Check whether you run Apache Solr or org.apache.solr:solr-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.apache.solr:solr-core (Maven): upgrade to 8.4.0 or later

  ```sh
  # set org.apache.solr:solr-core to 8.4.0 in your pom.xml or build.gradle
  ```


## Affected products

- Apache Solr 5.0.0 to 8.3.1

## Identifiers

- CVE-2019-17558
- GHSA-ww97-9w65-2crx

## Timeline

- 2021-11-03: disclosed
- exploited: Reported exploited in the wild.

## Related threats

- [Apache Solr hardcoded credentials in Basic Authentication setup tool](https://junglewise.ai/threats/cve-2026-44825-apache-solr-hardcoded-credentials-in-basic-authentication-setup)
- [Apache Solr: Unauthorized bypass of certain "predefined permission" rules in the RuleBasedAuthorizationPlugin](https://junglewise.ai/threats/cve-2026-22022-apache-solr-unauthorized-bypass-of-certain-predefined-permission)
- [Apache Solr: Insufficient file-access checking in standalone core-creation requests](https://junglewise.ai/threats/cve-2026-22444-apache-solr-insufficient-file-access-checking-in-standalone-core)
- [Apache Solr vulnerable to Execution with Unnecessary Privileges](https://junglewise.ai/threats/cve-2025-24814-apache-solr-vulnerable-to-execution-with-unnecessary-privileges)
- [Apache Solr Relative Path Traversal vulnerability](https://junglewise.ai/threats/cve-2024-52012-apache-solr-relative-path-traversal-vulnerability)