CVE-2024-45216
CriticalExploitedImproper Authentication vulnerability in Apache Solr
Published Oct 17, 2024 · Updated Oct 8, 2026 · Also known as BIT-solr-2024-45216, GHSA-mjvf-4h88-6xm3, TR-24-1715, UBUNTU-CVE-2024-45216
Key Facts
Patch immediately- CVE-2024-45216 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Solr (Apache), lucene-solr (debian), org.apache.solr:solr (maven).
- It is exploited in the wild, listed in Industry KEV feed since Oct 31, 2025. No public exploit code is known.
- EPSS estimates a 93% probability of exploitation in the next 30 days.
- Fixed versions are available, including Solr 8.11.4, Solr 9.7.0, org.apache.solr:solr 8.11.4.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (30-day exploit likelihood)
93%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2024-45216 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Improper Authentication vulnerability in Apache Solr.
Solr instances using the PKIAuthenticationPlugin, which is enabled by default when Solr Authentication is used, are vulnerable to Authentication bypass. A fake ending at the end of any Solr API URL path, will allow requests to skip Authentication while maintaining the API contract with the original URL Path. This fake ending looks like an unprotected API path, however it is stripped off internally after authentication but before API routing.
This issue affects Apache Solr: from 5.3.0 before 8.11.4, from 9.0.0 before 9.7.0.
Users are recommended to upgrade to version 9.7.0, or 8.11.4, which fix the issue.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 31, 2025 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
17 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SolrApache | >= 5.3.0 | 8.11.4 |
| lucene-solrdebian | See advisory | 0 |
| org.apache.solr:solrmaven | >= 5.3.0 | 9.7.0 |
Patched Releases
Solr
8.11.4, 9.7.0
org.apache.solr:solr
8.11.4, 9.7.0
Timeline
Publicly disclosed
Oct 17, 2024
Added to Industry KEV feed
Oct 31, 2025
Last updated
Oct 8, 2026
Weakness Type
- CWE-287 Improper Authentication
- CWE-863 Incorrect Authorization
References
- advisoryhttps://cloudstack.apache.org/blog/security-release-advisory-4.18.2.4-4.19.1.2
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2024/45xxx/CVE-2024-45216.json
- advisoryhttps://lists.apache.org/thread/ktsfjcnj22x4kg49ctock3d9tq7jnvlo
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2024-45216
FAQ
Common Questions.
Improper Authentication vulnerability in Apache Solr.
Affected: Solr (Apache) versions >= 5.3.0; lucene-solr (debian); org.apache.solr:solr (maven) versions >= 5.3.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 31, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Solr 8.11.4, Solr 9.7.0, org.apache.solr:solr 8.11.4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2024-45216 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo