No exploitation reportedFix available

CVE-2017-9803

Q: Is CVE-2017-9803 actively exploited?

Active exploitation of CVE-2017-9803 has not been confirmed. Its EPSS score was 2.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2017-9803?

CVE-2017-9803 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2017-09-18
WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2017-09-1821:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9803?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9803?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apache solr

Branch	Affected	Fixed in	Source
6.2	= 6.2.0	no fix published	NVD
6.2	= 6.2.1	no fix published	NVD
6.3	= 6.3.0	no fix published	NVD
6.4	= 6.4.0	no fix published	NVD
6.4	= 6.4.1	no fix published	NVD
6.4	= 6.4.2	no fix published	NVD
6.5	= 6.5.0	no fix published	NVD
6.5	= 6.5.1	no fix published	NVD
6.6	= 6.6.0	no fix published	NVD

solr-core

Branch	Affected	Fixed in	Source
6.x	≥ 6.2.0, < 6.6.1	6.6.1	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.06read 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score2.2 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2017-09-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-9803?

Is CVE-2017-9803 actively exploited?

Active exploitation of CVE-2017-9803 has not been confirmed. Its EPSS score was 2.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-9803?

CVE-2017-9803 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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