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CVE-2019-17558

Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability

  • High 7.5
  • Exploited: added to CISA KEV 3 Nov 2021

Description

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).

Key facts

Published
30 Dec 2019
Last changed
21 Oct 2025
Assigned by
apache
KEV added
3 Nov 2021
KEV fix due
3 May 2022
EPSS
98.567% likely to be exploited in the next 30 days, higher than 99.923% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.5CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
n/aApache Solr
  • Apache Solr 5.0.0 to Apache Solr 8.3.1 (affected)

Timeline

  1. 30 Dec 2019 Published
  2. 3 Nov 2021 CVE-2019-17558 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

Weakness

References