Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2017-9803

26
FAUCET Score

CVE-2017-9803 is a high-severity vulnerability affecting Apache Solr versions prior to 6.6.1, specifically within its Kerberos plugin when configured for delegation tokens and using SecurityAwareZkACLProvider. This flaw allows authenticated, low-privileged attackers to leak security configuration and escalate privileges, potentially leading to unauthorized access, modification of private data, or disruption of Solr cluster operations. The attack requires low privileges and high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
6.2.0CPE matchmatch criteria
cpe:2.3:a:apache:solr:6.2.0:*:*:*:*:*:*:*
6.2.1CPE matchmatch criteria
cpe:2.3:a:apache:solr:6.2.1:*:*:*:*:*:*:*
6.3.0CPE matchmatch criteria
cpe:2.3:a:apache:solr:6.3.0:*:*:*:*:*:*:*
6.4.0CPE matchmatch criteria
cpe:2.3:a:apache:solr:6.4.0:*:*:*:*:*:*:*
6.4.1CPE matchmatch criteria
cpe:2.3:a:apache:solr:6.4.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.20%
Probability of exploitation in next 30 days
EPSS Percentile
80.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0220 is in the 76th percentile among its peer group of 1,162 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.solr:solr-coreFixed in: 6.6.1

Vendor Advisories (2)

mavenGHSA-f553-j2gv-g5r9high

Apache Solr Kerberos delegation token functionality flaws

May 14, 2022
redhatCVE-2017-9803Important

solr: Kerberos delegation token functionality allows to re-use authentication

Sep 18, 2017

References

mail-archives.us.apache.org / mod_mbox/www-announce/201709.mbox/%3CCAOOKt53AOScg04zUh0%2BR_fcXD0C9s5mQ-OzdgYdnHz49u1KmXw%40mail.gmail.com%3E
securityfocus.com / bid/100870
Third Party AdvisoryVDB Entry