CVE-2019-17558: Solr core Improper Input Validation Vulnerability

HIGH
Advisory Identifier: GHSA-ww97-9w65-2crx
Share
CVSS 7.5
CWE-94 CWE-20 CWE-74
Published
Advisory Summary

CVE-2019-17558 is a HIGH (CVSS 7.5) improper input validation vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Solr core libraries in the Maven ecosystem. The issue involves improper input validation in apache solr. Remediation is available by upgrading affected packages to version 8.4.0.

CVE-2019-17558 at a Glance

CVE Identifier CVE-2019-17558
GHSA Identifier GHSA-ww97-9w65-2crx
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Solr core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-17558

To remediate this vulnerability, upgrade all affected Solr core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.solr:solr-core fixed: 8.4.0 
<dependency>
    <groupId>org.apache.solr</groupId>
    <artifactId>solr-core</artifactId>
    <version>8.4.0</version>
</dependency>
org.apache.solr:solr-core fixed: 8.4.0 
<dependency>
    <groupId>org.apache.solr</groupId>
    <artifactId>solr-core</artifactId>
    <version>8.4.0</version>
</dependency>
org.apache.solr:solr-core fixed: 8.4.0 
<dependency>
    <groupId>org.apache.solr</groupId>
    <artifactId>solr-core</artifactId>
    <version>8.4.0</version>
</dependency>
org.apache.solr:solr-core fixed: 8.4.0 
<dependency>
    <groupId>org.apache.solr</groupId>
    <artifactId>solr-core</artifactId>
    <version>8.4.0</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.solr

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2019-17558, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.solr

Analyze the terminal output to locate any version of Solr core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.4.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.solr command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Solr core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter. A Velocity template can be provided through Velocity templates in a configset `velocity/` directory or as a parameter. A user defined configset could contain renderable, potentially malicious, templates. Parameter provided templates are disabled by default, but can be enabled by setting `params.resource.loader.enabled` by defining a response writer with that setting set to `true`. Defining a response writer requires configuration API access. Solr 8.4 removed the params resource loader entirely, and only enables the configset-provided template rendering when the configset is `trusted` (has been uploaded by an authenticated user).

CVE-2019-17558 Affected Solr core Versions

4 component(s)
Fixed Versions:
8.4.0
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.solr:solr-core
maven/org.apache.solr/solr-core
Maven
≥ 5.0.0
< 8.4.0
8.4.0
org.apache.solr:solr-core
maven/org.apache.solr/solr-core
Maven
≥ 6.0.0
< 8.4.0
8.4.0
org.apache.solr:solr-core
maven/org.apache.solr/solr-core
Maven
≥ 7.0.0
< 8.4.0
8.4.0
org.apache.solr:solr-core
maven/org.apache.solr/solr-core
Maven
≥ 8.0.0
< 8.4.0
8.4.0

References

NVD — CVE-2019-17558 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-17558
Solr core Source Repository REPOSITORY
https://github.com/apache/lucene-solr/pull/1156
lists.apache.org/thread.html/r7f21ab... WEB
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https://lists.apache.org/thread.html/r7f21ab40a9b17b1a703db84ac56773fcabacd4cc1eb5c4700d17c071@%3Cissues.lucene.apache.org%3E
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www.cisa.gov/known-exploited-vul... WEB
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17558
Solr core Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2020.html
Solr core Source Repository REPOSITORY
https://github.com/apache/lucene-solr
issues.apache.org/jira/browse/solr-13... WEB
https://issues.apache.org/jira/browse/SOLR-13971
issues.apache.org/jira/browse/solr-14... WEB
https://issues.apache.org/jira/browse/SOLR-14025
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Solr core Security Information SECURITY
http://packetstormsecurity.com/files/157078/Apache-Solr-8.3.0-Velocity-Template-Remote-Code-Execution.html

Frequently Asked Questions

What is CVE-2019-17558?
CVE-2019-17558 is a security vulnerability in Solr core involving Improper Input Validation in Apache Solr under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Solr core versions are affected?
Affected versions include releases prior to 8.4.0 across affected packages: org.apache.solr:solr-core.
What version fixes CVE-2019-17558?
Upgrading to 8.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is solr-core affected?
Yes, org.apache.solr:solr-core is affected in releases prior to 8.4.0. Upgrade your dependency to 8.4.0 or later.
What is the CVSS score of CVE-2019-17558?
CVE-2019-17558 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H.
What CWE is associated with CVE-2019-17558?
CVE-2019-17558 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check Maven dependencies for CVE-2019-17558?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.solr'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ww97-9w65-2crx",
  "modified" : "2025-10-22T17:45:47Z",
  "published" : "2020-02-12T18:45:28Z",
  "aliases" : [ "CVE-2019-17558" ],
  "summary" : "Improper Input Validation in Apache Solr",
  "details" : "Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter. A Velocity template can be provided through Velocity templates in a configset `velocity/` directory or as a parameter. A user defined configset could contain renderable, potentially malicious, templates. Parameter provided templates are disabled by default, but can be enabled by setting `params.resource.loader.enabled` by defining a response writer with that setting set to `true`. Defining a response writer requires configuration API access. Solr 8.4 removed the params resource loader entirely, and only enables the configset-provided template rendering when the configset is `trusted` (has been uploaded by an authenticated user).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.solr:solr-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "8.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.5.5"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.solr:solr-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "8.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 6.6.6"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.solr:solr-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "8.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 7.7.2"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.solr:solr-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 8.3.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-17558"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/lucene-solr/pull/1156"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/r7f21ab40a9b17b1a703db84ac56773fcabacd4cc1eb5c4700d17c071%40%3Cissues.lucene.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/r7f21ab40a9b17b1a703db84ac56773fcabacd4cc1eb5c4700d17c071@%3Cissues.lucene.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/r8a36e4f92f4449dec517e560e1b55639f31b3aca26c37bbad45e31de%40%3Cissues.lucene.apache.org%3E"
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  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-74", "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-02-11T19:43:12Z",
    "nvd_published_at" : "2019-12-30T17:15:00Z"
  }
}