Vulnerabilities > CVE-2021-27905 - Server-Side Request Forgery (SSRF) vulnerability in Apache Solr

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
apache
CWE-918
critical
NVD
Published: 2021-04-13
Updated: 2024-11-21

Summary

The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. Prior to this bug getting fixed, it did not. This problem affects essentially all Solr versions prior to it getting fixed in 8.8.2.

Vulnerable Configurations

Part Description Count
Application
Apache
111

Common Weakness Enumeration (CWE)

References