Apache Solr shards Parameter Server Side Request Forgery Vulnerability High [CVE-2017-3164]

CVE Number – CVE-2017-3164

A vulnerability in the shards parameter of Apache Solr could allow an unauthenticated, remote attacker to conduct a server-side request forgery (SSRF) on a targeted system.The vulnerability exists because the shards parameter of the affected software does not have a corresponding whitelist mechanism. An attacker could exploit this vulnerability by forcing the server to prompt Solr to perform arbitrary HTTP GET requests. A successful exploit could allow the attacker to bypass certain security restrictions and perform other unauthorized actions.Apache has confirmed this vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must have network access and the ability to issue HTTP GET requests from the Solr system. These requirements could reduce the likelihood of a successful exploit.


  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

Fixed Software

  • Apache has released a software update at the following link: 7.7.0 or later

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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