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CVE-2019-17558

Apache Solr VelocityResponseWriter Plug-In Remote Code Execution

7.5 HIGHActively exploited (CISA KEV)Public exploitEPSS 98.6%
  1. Published30 Dec 2019
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

The Apache Solr VelocityResponseWriter plug-in contains an unspecified vulnerability which can allow for remote code execution.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022

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).

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Solr≥ 5.0.0 < 7.7.3 · ≥ 8.0.0 < 8.4.0
Oracle Primavera Unifier≥ 17.7 ≤ 17.12 · 16.1 · 16.2 · 18.8

Remediation

Fixed in
Apache Solr≥ 7.7.3

References

and 20 more references

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Frequently asked

Is CVE-2019-17558 being actively exploited?

Yes. CVE-2019-17558 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2019-17558?

CVE-2019-17558 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 98.6% probability of exploitation.

Which products are affected by CVE-2019-17558?

Affected products include Apache Solr, Oracle Primavera Unifier.

How do I fix CVE-2019-17558?

Upgrade affected software to a fixed version, for example Apache Solr 7.7.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-17558 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.