# Solr vulnerabilities > Solr is made by Apache. We track 40 published vulnerabilities in it, across 131 versions. 3 of them are on the list of flaws known to be exploited, the newest added on 10 October 2023. If you run Solr, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/apache/solr ## At a glance - **Made by:** [Apache](https://www.precursorintelligence.com/vendors/apache) - **Published vulnerabilities:** 40 - **Known to be exploited:** 3 - **Versions tracked:** 131 - **Most recently added to the known-exploited list:** [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487), 10 October 2023. We keep watching the list. ## Which versions of Solr do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "before 9.4.0" means every version up to, but not including, 9.4.0. - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487) (HTTP/2 Rapid Reset Attack Vulnerability): before 9.4.0 - [CVE-2019-0193](https://www.precursorintelligence.com/what-is/cve-2019-0193) (Apache Solr DataImportHandler Code Injection Vulnerability): before 7.7.3, 8.1.0 to before 8.1.2 - [CVE-2019-17558](https://www.precursorintelligence.com/what-is/cve-2019-17558) (Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability): 5.0.0 to before 7.7.3, 8.0.0 to before 8.4.0 ## Which Solr vulnerabilities are being exploited? 3 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): HTTP/2 Rapid Reset Attack Vulnerability. High, CVSS 7.5, chance of use in 30 days >99%, known exploited since 10 October 2023. - [CVE-2019-0193](https://www.precursorintelligence.com/what-is/cve-2019-0193): Apache Solr DataImportHandler Code Injection Vulnerability. High, CVSS 7.2, chance of use in 30 days 84%, known exploited since 10 December 2021. - [CVE-2019-17558](https://www.precursorintelligence.com/what-is/cve-2019-17558): Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Vulnerability. High, CVSS 7.5, chance of use in 30 days 99%, known exploited since 3 November 2021. ## Which Solr flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): >99%, High (CVSS 7.5), known exploited - [CVE-2019-17558](https://www.precursorintelligence.com/what-is/cve-2019-17558): 99%, High (CVSS 7.5), known exploited - [CVE-2021-27905](https://www.precursorintelligence.com/what-is/cve-2021-27905): 93%, Critical (CVSS 9.8) - [CVE-2017-12629](https://www.precursorintelligence.com/what-is/cve-2017-12629): 92%, Critical (CVSS 9.8) - [CVE-2023-50386](https://www.precursorintelligence.com/what-is/cve-2023-50386): 84%, High (CVSS 8.8) - [CVE-2019-0193](https://www.precursorintelligence.com/what-is/cve-2019-0193): 84%, High (CVSS 7.2), known exploited - [CVE-2020-13957](https://www.precursorintelligence.com/what-is/cve-2020-13957): 79%, Critical (CVSS 9.8) - [CVE-2019-0192](https://www.precursorintelligence.com/what-is/cve-2019-0192): 78%, Critical (CVSS 9.8) - [CVE-2020-27223](https://www.precursorintelligence.com/what-is/cve-2020-27223): 78%, Medium (CVSS 5.2) - [CVE-2023-50290](https://www.precursorintelligence.com/what-is/cve-2023-50290): 68%, Medium (CVSS 6.5) ## Questions ### How many vulnerabilities does Solr have? We track 40 published vulnerabilities listed under the name Solr, across 131 versions. The most recent Solr flaw added to the known-exploited list is CVE-2023-44487, on 10 October 2023. ### Which Solr vulnerabilities are being exploited? 3 are on the list of flaws known to be exploited. The most recently added are CVE-2023-44487, CVE-2019-0193 and CVE-2019-17558. ### Which versions of Solr do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2023-44487, affects before 9.4.0. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Solr? Create a Precursor Intelligence account and track Solr. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Solr? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact