Is CVE-2019-17558 being actively exploited?

Yes — CVE-2019-17558 is in CISA's Known Exploited Vulnerabilities (KEV) catalog, so it is confirmed exploited in the wild. Patch affected products as a priority.

What products does CVE-2019-17558 affect?

Tracked products affected include Apache Solr. Check the version you run to see whether it is affected.

How do I fix CVE-2019-17558?

This vulnerability is being actively exploited in the wild — patch affected products urgently. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2019-17558

Q: What is CVE-2019-17558?

CVE-2019-17558 is a high-severity software vulnerability (Injection) with a CVSS score of 7.5. 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 us

HIGH severity · CVSS 7.5 · Injection · actively exploited (CISA KEV)

7.5CVSS HIGH exploited

Actively exploited in the wild (CISA Known Exploited Vulnerabilities). Added to KEV 2021-11-03. US federal agencies must patch by 2022-05-03.

Summary

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).

Impact & exploitability

Attack vectorNetwork

Attack complexityHigh

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)99%

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Apache Solr

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Official patch: https://issues.apache.org/jira/browse/SOLR-13971 ↗

CVE-2019-17558

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information