Apache Solr information disclosure vulnerability through DataImportHandler

published 2021-12-23 4 y ago modified 2026-09-08 2 mo ago also BIT-solr-2021-44548 , EUVD-2022-0662 , GHSA-pccr-q7v9-5f27

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 5.2%; EPSS 5.2% chance of exploitation in 30 days, percentile 92%
public exploits: 0; none known

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.

Patch / fix

fixed in 3

maven org.apache.solr:solr-parent 8.11.1
bitnami solr 8.11.1
Apache Software Foundation Apache Solr 8.11.1

Exploit prediction

5.23% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
OSV	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.apache.solr:solr-parent	<8.11.1	8.11.1
bitnami	solr	<8.11.1	8.11.1

Affected products

Apache Software Foundation Apache Solr

Classification

Weakness

CWE-40 Path Traversal: '\\UNC\share\name\' (Windows UNC Share)
CWE-20 Improper Input Validation
CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

solr.apache.org /security.html#cve-2021-44548-apache-solr-information-disclosure-vulnerability-through-dataimporthandler
web, vendor-advisory, advisory
security.netapp.com /advisory/ntap-20220114-0005/
third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2021-44548
advisory, web
github.com /apache/solr
package
security.netapp.com /advisory/ntap-20220114-0005
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary