CVE-2017-7660

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.

Published: 2017-07-07 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-7660 is rated High Risk (67.1/100): CVSS High severity, with high exploitation likelihood (EPSS 5.53%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +5.19% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-7660

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.34% 5.53% +5.19%
2 2026-04-29 0.46% 0.34% -0.12%
3 2025-11-21 — 0.46% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-7660

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-7660

GitHub Security Advisory for CVE-2017-7660

GHSA-c82r-qg3w-q5mv · Severity: high · Ecosystem: maven — Apache Solr insecure inter-node communication

OS Trackers for CVE-2017-7660

vendor priority summary link
debian unimportant CVE-2017-7660 unimportant priority: Debian including 1 source packages (lucene-solr), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-7660
redhat medium — https://access.redhat.com/security/cve/CVE-2017-7660
ubuntu medium CVE-2017-7660 medium priority: Ubuntu including 1 source packages (lucene-solr), 5 status rows across 5 suites (trusty, upstream, xenial, yakkety, zesty): not-affected 4, needs-triage 1. https://ubuntu.com/security/CVE-2017-7660

Affected software / configurations for CVE-2017-7660

Vendor Product Version Raw CPE
apache solr 5.3.0 cpe:2.3:a:apache:solr:5.3.0:*:*:*:*:*:*:*
apache solr 5.3.1 cpe:2.3:a:apache:solr:5.3.1:*:*:*:*:*:*:*
apache solr 5.3.2 cpe:2.3:a:apache:solr:5.3.2:*:*:*:*:*:*:*
apache solr 5.4.0 cpe:2.3:a:apache:solr:5.4.0:*:*:*:*:*:*:*
apache solr 5.4.1 cpe:2.3:a:apache:solr:5.4.1:*:*:*:*:*:*:*
apache solr 5.5.0 cpe:2.3:a:apache:solr:5.5.0:*:*:*:*:*:*:*
apache solr 5.5.1 cpe:2.3:a:apache:solr:5.5.1:*:*:*:*:*:*:*
apache solr 5.5.2 cpe:2.3:a:apache:solr:5.5.2:*:*:*:*:*:*:*
apache solr 5.5.3 cpe:2.3:a:apache:solr:5.5.3:*:*:*:*:*:*:*
apache solr 5.5.4 cpe:2.3:a:apache:solr:5.5.4:*:*:*:*:*:*:*
apache solr 6.0.0 cpe:2.3:a:apache:solr:6.0.0:*:*:*:*:*:*:*
apache solr 6.0.1 cpe:2.3:a:apache:solr:6.0.1:*:*:*:*:*:*:*
apache solr 6.1.0 cpe:2.3:a:apache:solr:6.1.0:*:*:*:*:*:*:*
apache solr 6.2.0 cpe:2.3:a:apache:solr:6.2.0:*:*:*:*:*:*:*
apache solr 6.2.1 cpe:2.3:a:apache:solr:6.2.1:*:*:*:*:*:*:*
apache solr 6.3.0 cpe:2.3:a:apache:solr:6.3.0:*:*:*:*:*:*:*
apache solr 6.4.0 cpe:2.3:a:apache:solr:6.4.0:*:*:*:*:*:*:*
apache solr 6.4.1 cpe:2.3:a:apache:solr:6.4.1:*:*:*:*:*:*:*
apache solr 6.4.2 cpe:2.3:a:apache:solr:6.4.2:*:*:*:*:*:*:*
apache solr 6.5.0 cpe:2.3:a:apache:solr:6.5.0:*:*:*:*:*:*:*
apache solr 6.5.1 cpe:2.3:a:apache:solr:6.5.1:*:*:*:*:*:*:*

References for CVE-2017-7660

cvelogic Threat Intelligence