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Fencer Intel
high 7.5

CVE-2017-7660 json

Apache Solr insecure inter-node communication

published 2017-07-07 9 y ago modified 2026-06-17 4 mo ago also GHSA-c82r-qg3w-q5mv , EUVD-2022-3531

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Apache Solr uses a PKI based mechanism to secure inter-node communication when security is enabled. It is possible to create a specially crafted node name that does not exist as part of the cluster and point it to a malicious node. This can trick the nodes in cluster to believe that the malicious node is a member of the cluster. So, if Solr users have enabled BasicAuth authentication mechanism using the BasicAuthPlugin or if the user has implemented a custom Authentication plugin, which does not implement either "HttpClientInterceptorPlugin" or "HttpClientBuilderPlugin", his/her servers are vulnerable to this attack. Users who only use SSL without basic authentication or those who use Kerberos are not affected.

Patch / fix

  • maven org.apache.solr:solr-core 5.5.5, 6.6.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7660 updated cvss 7.4

solr: Insufficient authentization for inter-node communication

  • Red Hat JBoss Fuse Service Works 6 solr-core
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Data Grid 6 solr-core Red Hat JBoss Data Virtualization 6 solr-core Red Hat JBoss Enterprise Application Platform 6 solr-core Red Hat JBoss Fuse 6 camel Red Hat JBoss Portal 6 solr-core
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.63% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.solr:solr-core
>=5.3.0, <5.5.5
>=6.0.0, <6.6.0
5.5.5
6.6.0

Affected products

  • Apache Software Foundation Apache Solr

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.