CVE-2017-20189

CRITICALNVD 9.89.8—

9.8

In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 87.5%
KEV: Not listed

Published

January 22, 2024

Last Modified

November 3, 2025

References (11)

cve@mitrehttps://clojure.atlassian.net/browse/CLJ-2204
cve@mitrehttps://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3
cve@mitrehttps://github.com/frohoff/ysoserial/pull/68/files
cve@mitrehttps://hackmd.io/%40fe1w0/HyefvRQKp
cve@mitrehttps://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378
af854a3a-2127-422b-91ae-364da2661108https://clojure.atlassian.net/browse/CLJ-2204
af854a3a-2127-422b-91ae-364da2661108https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3
af854a3a-2127-422b-91ae-364da2661108https://github.com/frohoff/ysoserial/pull/68/files
af854a3a-2127-422b-91ae-364da2661108https://hackmd.io/%40fe1w0/HyefvRQKp
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20241108-0002/
af854a3a-2127-422b-91ae-364da2661108https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378

Affected Packages

(1 across 1 ecosystem)

Maven(1)

Package	Vulnerable range	Fixed in	Dependents
org.clojure:clojure	1.0.0 ... 1.9.0-beta4 (115 versions)	1.9.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-502Deserialization of Untrusted Data

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 09:53 UTCEG score recompute

Frequently asked(5)

What is CVE-2017-20189?

CVE-2017-20189 is a critical vulnerability published on January 22, 2024. In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.

When was CVE-2017-20189 disclosed?

CVE-2017-20189 was first published in the National Vulnerability Database on January 22, 2024, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2017-20189 actively exploited?

CVE-2017-20189 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2017-20189?

CVE-2017-20189 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2017-20189?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-20189, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-20189

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