{"cve":"CVE-2021-44548","nvd":{"published":"2021-12-23T09:15:06.693","modified":"2026-06-17T04:12:33.187","status":"Modified","description":"An Improper Input Validation vulnerability in DataImportHandler of Apache Solr allows an attacker to provide a Windows UNC path resulting in an SMB network call being made from the Solr host to another host on the network. If the attacker has wider access to the network, this may lead to SMB attacks, which may result in: * The exfiltration of sensitive data such as OS user hashes (NTLM/LM hashes), * In case of misconfigured systems, SMB Relay Attacks which can lead to user impersonation on SMB Shares or, in a worse-case scenario, Remote Code Execution This issue affects all Apache Solr versions prior to 8.11.1. This issue only affects Windows.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-22","CWE-20","CWE-40"],"references":["https://security.netapp.com/advisory/ntap-20220114-0005/","https://solr.apache.org/security.html#cve-2021-44548-apache-solr-information-disclosure-vulnerability-through-dataimporthandler","https://security.netapp.com/advisory/ntap-20220114-0005/","https://solr.apache.org/security.html#cve-2021-44548-apache-solr-information-disclosure-vulnerability-through-dataimporthandler"],"products":["apache:solr"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-44548","score":0.05234,"percentile":0.92524,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-pccr-q7v9-5f27","url":"https://osv.dev/vulnerability/GHSA-pccr-q7v9-5f27","summary":"Apache Solr Improper Input Validation and Path Traversal","modified":"2024-02-16T08:19:55.616303Z","packages":[{"ecosystem":"Maven","name":"org.apache.solr:solr-parent","purl":"pkg:maven/org.apache.solr/solr-parent","ranges":["<8.11.1"],"fixed":["8.11.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}