CVE-2020-17516

mediumpriority · track · 31EPSS 0.019 · 80 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.93% (80th) EPSS

CVSS 4.3 · medium

Is it mine?

14 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Apache Cassandra versions 2.1.0 to 2.1.22, 2.2.0 to 2.2.19, 3.0.0 to 3.0.23, and 3.11.0 to 3.11.9, when using 'dc' or 'rack' internode_encryption setting, allows both encrypted and unencrypted internode connections. A misconfigured node or a malicious user can use the unencrypted connection despite not being in the same rack or dc, and bypass mutual TLS requirement.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–7.5

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-290USprimaryCWE-290US

affected products (14)

Products and version ranges known to be affected.

n/a Apache Cassandra≤ 3.0.0 to 3.0.23enisa_euvdEU
n/a Apache Cassandra≤ 3.11.0 to 3.11.9enisa_euvdEU
n/a Apache Cassandra≤ 2.2.0 to 2.2.19enisa_euvdEU
n/a Apache Cassandra≤ 2.1.0 to 2.1.22enisa_euvdEU
apache cassandra2.1.0 → 2.1.22nvdUScpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
apache cassandra2.2.0 → 2.2.19nvdUScpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
apache cassandra3.0.0 → 3.0.23nvdUScpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
apache cassandra3.11.0 → 3.11.9nvdUScpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
Bitnami cassandra2.1.0 → 2.1.23osvUSpkg:bitnami/cassandra
Bitnami cassandra2.2.0 → 2.2.20osvUSpkg:bitnami/cassandra
Bitnami cassandra3.0.0 → 3.0.24osvUSpkg:bitnami/cassandra
Bitnami cassandra3.11.0 → 3.11.10osvUSpkg:bitnami/cassandra
Maven org.apache.cassandra:cassandra-all2.1.0 → 3.0.24osvUSpkg:maven/org.apache.cassandra/cassandra-all
Maven org.apache.cassandra:cassandra-all3.11.0 → 3.11.10osvUSpkg:maven/org.apache.cassandra/cassandra-all

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-2vxm-vp4c-fjfwAuthentication Bypass in Apache Cassandra2022-02-09ghsa · osvUS
Apache Cassandra versions 2.1.0 to 2.1.22, 2.2.0 to 2.2.19, 3.0.0 to 3.0.23, and 3.11.0 to 3.11.9, when using 'dc' or 'rack' internode_encryption setting, allows both encrypted and unencrypted internode connections. A misconfigured node or a malicious user can use the unencrypted connection despite not being in the same rack or dc, and bypass mutual TLS requirement.
BIT-cassandra-2020-175162024-03-06vendor · osvUS
Apache Cassandra versions 2.1.0 to 2.1.22, 2.2.0 to 2.2.19, 3.0.0 to 3.0.23, and 3.11.0 to 3.11.9, when using 'dc' or 'rack' internode_encryption setting, allows both encrypted and unencrypted internode connections. A misconfigured node or a malicious user can use the unencrypted connection despite not being in the same rack or dc, and bypass mutual TLS requirement.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2021-02-03modified 2026-06-17

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references (19)

External citations — patches, advisories, analysis.

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