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CVE-2019-17558

Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter. A Velocity template…

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).

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability.

Added
3 Nov 2021
Fix due (US federal)
3 May 2022
Used by ransomware
Not known

Apply updates per vendor instructions.

ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 3 Nov 2021.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module, a Nuclei template and 2 Exploit-DB entries for it. CISA's SSVC rates its exploitation: it is being exploited.

Show the exploits4

Metasploit modules1 module

Nuclei templates1 template

Exploit-DB2 entries

Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from

Timeline

  1. ID reserved

    By apache

  2. · 3 months later

    Published

  3. · 22 months later

    Added to CISA KEV

    Known exploited in the wild

  4. · 4 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2019-17558, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
98.6% · top 0.1% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • Apache Solr

    • affected Apache Solr 5.0.0 to Apache Solr 8.3.1

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References

References30

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .