CVE-2019-17558: Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter.
Noroxi assessment
Priority: Now (action score 90/100)
- CISA has confirmed exploitation in the wild (Nov 3, 2021). Remediation deadline for US federal agencies: May 3, 2022.
- A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
- Probability of exploitation in the next 30 days: 98.5% (FIRST EPSS); higher than 99.9% of all records.
- Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
- Fixed version: org.apache.solr:solr-core (Maven) 8.4.0.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Patch today or shut off access. Upgrade to org.apache.solr:solr-core (Maven) 8.4.0 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS
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).
- Published
- Dec 30, 2019
- Updated
- Jun 16, 2026
- EPSS
- 98.5% · 99th percentile
- CWE
- CWE-74
Report tools
Action score
90
Patch today or shut off access.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 30 / 30 · 98.5%
CISA SSVC decision
- Exploitation
- active
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Nov 3, 2021. That signals real attacks, not theory.
Remediation deadline for US federal agencies: May 3, 2022.
Get told when this record changes
- In CISA KEV: exploitation in the wild confirmed
- Weaponized exploit exists
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| apache | solr | cpe:2.3:a:apache:solr |
| oracle | primavera unifier | cpe:2.3:a:oracle:primavera_unifier |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
n/a Apache Solr
- Apache Solr 5.0.0 to Apache Solr 8.3.1affected
Affected versions · NVD (7)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache solr5.0.0 and later · before 7.7.3
- apache solr8.0.0 and later · before 8.4.0
- oracle primavera unifier17.7 and later · up to 17.12 inclusive
- oracle primavera unifier16.1
- oracle primavera unifier16.2
- oracle primavera unifier18.8
- oracle primavera unifier19.12
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | lucene-solr | from 0 | — |
| Maven | org.apache.solr:solr-core | from 5.0.0 · before 8.4.0 | 8.4.0 |
| Maven | org.apache.solr:solr-core | from 6.0.0 · before 8.4.0 | 8.4.0 |
| Maven | org.apache.solr:solr-core | from 7.0.0 · before 8.4.0 | 8.4.0 |
| Maven | org.apache.solr:solr-core | from 8.0.0 · before 8.4.0 | 8.4.0 |
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-0193In Apache Solr, the DataImportHandler, an optional but popular module to pull in data from databases and other sources, has a feature in…KEV83Now
- CVE-2024-45216Apache Solr: Authentication bypass possible using a fake URL Path ending67This week
- CVE-2021-27905SSRF vulnerability with the Replication handler67This week
Published before and after this one in the same product
- ← EarlierCVE-2019-12401Sep 10, 2019 · Solr versions 1.3.0 to 1.4.1, 3.1.0 to 3.6.2 and 4.0.0 to 4.10.4 are vulnerable to an XML resource consumption attack (a.k.a.33Monitor
- ← EarlierCVE-2019-12409Nov 18, 2019 · The 8.1.1 and 8.2.0 releases of Apache Solr contain an insecure setting for the ENABLE_REMOTE_JMX_OPTS configuration option in the default…45Plan
- Later →CVE-2018-11802Apr 1, 2020 · In Apache Solr, the cluster can be partitioned into multiple collections and only a subset of nodes actually host any given collection.18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Maven:org.apache.solr:solr-core | 8.4.0 | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×2
- Nuclei detection template ×1
- Proof-of-concept repository on GitHub ×6
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | 6 repositories | 2020-03-27 → 2026-10-08 |
| Exploit-DB entry | webapps | 2019-11-01 |
| Exploit-DB entry | remote | 2020-04-16 |
| Metasploit module | exploit/multi/http/solr_velocity_rceApache Solr Remote Code Execution via Velocity Templateexploit | 2019-10-29 |
| Nuclei detection template | Nuclei template CVE-2019-17558 | — |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Metasploit-63 d
- First PoC-60 d
- Published
- CISA KEV+673 d
- TodayNov 14, 2026+2510 d
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0340 · Apr 21, 2021(Apache Solr Güvenlik Zafiyeti)
- TR-20-002 · Jan 2, 2020(Solr Güvenlik Güncellemesi)
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- HTTP Request SplittingCAPEC-105likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- Format String InjectionCAPEC-135likelihood: High · High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- lists.apache.org/thread.html/r12ab2cb15a34e49b4fecb5b2bdd7e10f3e8b7bf1f4f47fcde34d3a7c%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r19d23e8640236a3058b4d6c23e5cd663fde182255f5a9d63e0606a66%40%3Cdev.lucene.apache.org%3E
- lists.apache.org/thread.html/r1d4a247329a8478073163567bbc8c8cb6b49c6bfc2bf58153a857af1%40%3Ccommits.druid.apache.org%3E
- lists.apache.org/thread.html/r204ba2a9ea750f38d789d2bb429cc0925ad6133deea7cbc3001d96b5%40%3Csolr-user.lucene.apache.org%3E
- lists.apache.org/thread.html/r25f1bd4545617f5b86dde27b4c30fec73117af65598a30e20209739a%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r339865b276614661770c909be1dd7e862232e3ef0af98bfd85686b51%40%3Cdev.lucene.apache.org%3E
- lists.apache.org/thread.html/r36e35fd76239a381643555966fb3e72139e018d52d76544fb42f96d8%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r58c58fe51c87bc30ee13bb8b4c83587f023edb349018705208e65b37%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r5dc200f7337093285bac40e6d5de5ea66597c3da343a0f7553f1bb12%40%3Csolr-user.lucene.apache.org%3E
- lists.apache.org/thread.html/r79c7e75f90e735fd32c4e3e97340625aab66c09dfe8c4dc0ab768b69%40%3Csolr-user.lucene.apache.org%3E
- lists.apache.org/thread.html/r7b89b3dcfc1b6c52dd8d610b897ac98408245040c92b484fe97a51a2%40%3Csolr-user.lucene.apache.org%3E
- lists.apache.org/thread.html/r7f21ab40a9b17b1a703db84ac56773fcabacd4cc1eb5c4700d17c071%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r8a36e4f92f4449dec517e560e1b55639f31b3aca26c37bbad45e31de%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r8e7a3c253a695a7667da0b0ec57f9bb0e31f039e62afbc00a1d96f7b%40%3Csolr-user.lucene.apache.org%3E
- lists.apache.org/thread.html/r9271d030452170ba6160c022757e1b5af8a4c9ccf9e04164dec02e7f%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/r99c3f7ec3a079e2abbd540ecdb55a0e2a0f349ca7084273a12e87aeb%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/ra29fa6ede5184385bf2c63e8ec054990a7d4622bba1d244bee70d82d%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/rafc939fdd753f55707841cd5886fc7fcad4d8d8ba0c72429b3220a9a%40%3Cissues.lucene.apache.org%3E
- lists.apache.org/thread.html/rb964fe5c4e3fc05f75e8f74bf6b885f456b7a7750c36e9a8045c627a%40%3Cissues.lucene.apache.org%3E
Vendor advisories and official records. Exploit/PoC links are deliberately left out.