---
title: "CVE-2024-45216: Improper Authentication vulnerability in Apache Solr"
url: https://erroneo.us/security/cve/CVE-2024-45216/
description: "CVE-2024-45216 (org.apache.solr:solr (Maven)): Improper Authentication vulnerability in Apache Solr. Solr instances using the PKIAuthenticationPlugin, which…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-10-16
date_modified: 2025-07-02
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-45216"
kev: false
cvss: 9.3
epss: 0.92747
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-45216: Improper Authentication vulnerability in Apache Solr

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 92.7% , percentile 99.8: FIRST’s model estimates a 92.7% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.solr:solr (Maven) >= 5.3.0, < 8.11.4, fixed in 8.11.4 ; org.apache.solr:solr (Maven) >= 9.0.0, < 9.7.0, fixed in 9.7.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Maven `org.apache.solr:solr` >= 5.3.0, < 8.11.4 → fixed: 8.11.4
- Maven `org.apache.solr:solr` >= 9.0.0, < 9.7.0 → fixed: 9.7.0

## Affected products (CVE record)

- Apache Software Foundation Apache Solr: 5.3.0 < 8.11.4, 9.0.0 < 9.7.0

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 4.0: 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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 92.75% probability of exploitation activity in the next 30 days; percentile 99.8.

## Sources

- [solr.apache.org](https://solr.apache.org/security.html#cve-2024-45216-apache-solr-authentication-bypass-possible-using-a-fake-url-path-ending)
- [GitHub Advisory GHSA-mjvf-4h88-6xm3](https://github.com/advisories/GHSA-mjvf-4h88-6xm3)
- [CVE.org record CVE-2024-45216](https://www.cve.org/CVERecord?id=CVE-2024-45216)
- [NVD entry CVE-2024-45216](https://nvd.nist.gov/vuln/detail/CVE-2024-45216)
- [openwall.com](http://www.openwall.com/lists/oss-security/2024/10/15/8)
- [issues.apache.org](https://issues.apache.org/jira/browse/SOLR-17417)

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Source page: https://erroneo.us/security/cve/CVE-2024-45216/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt