{"id":"CVE-2017-9803","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-9803","generatedAt":"2026-10-28T21:57:26.242Z","title":"Apache Solr's Kerberos plugin can be configured to use delegation tokens, which allows an application to reuse the authentication of an end-user or another application.","description":"Apache Solr's Kerberos plugin can be configured to use delegation tokens, which allows an application to reuse the authentication of an end-user or another application. There are two issues with this functionality (when using SecurityAwareZkACLProvider type of ACL provider e.g. SaslZkACLProvider). Firstly, access to the security configuration can be leaked to users other than the solr super user. Secondly, malicious users can exploit this leaked configuration for privilege escalation to further expose/modify private data and/or disrupt operations in the Solr cluster. The vulnerability is fixed from Apache Solr 6.6.1 onwards.","published":"2017-09-18T21:29:00.000Z","lastModified":"2026-06-17T01:28:57.000Z","status":"Modified","sourceIdentifier":"security@apache.org","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-287"],"affected":["apache/solr"],"epss":{"score":0.02194,"percentile":0.82368,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://mail-archives.us.apache.org/mod_mbox/www-announce/201709.mbox/%3CCAOOKt53AOScg04zUh0%2BR_fcXD0C9s5mQ-OzdgYdnHz49u1KmXw%40mail.gmail.com%3E","source":"security@apache.org"},{"url":"http://www.securityfocus.com/bid/100870","tags":["Third Party Advisory","VDB Entry"],"source":"security@apache.org"},{"url":"http://mail-archives.us.apache.org/mod_mbox/www-announce/201709.mbox/%3CCAOOKt53AOScg04zUh0%2BR_fcXD0C9s5mQ-OzdgYdnHz49u1KmXw%40mail.gmail.com%3E","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/100870","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-9803","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}