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Date: Sat, 18 Dec 2021 16:03:14 +0000
From: Jan H√łydahl <>
Subject: CVE-2021-44548: Apache Solr information disclosure vulnerability
 through DataImportHandler 

Severity: moderate


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.

This issue is being tracked as SOLR-15826


Upgrade to Solr 8.11.1, and/or ensure only trusted clients can make requests to Solr's DataImport handler.


Apache Solr would like to thank LaiHan of Nsfocus security team for reporting the issue


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