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CVE-2017-20189 — Vulnerability in org.clojure:clojure — CVE Details

CRITICAL

Clojure classes can be used to craft a serialized object that runs arbitrary code on deserialization

Published January 22, 2024Updated November 4, 2025Source: osv

Summary

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.

Advisory Timeline

  • First published January 22, 2024 (994 days ago).
  • Last revised November 4, 2025 — 652 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.clojure:clojure to 1.9.0 or later
<!-- Update pom.xml dependency version to 1.9.0 for org.clojure:clojure -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: maven (1).

PackageEcosystemAffectedFixed In
org.clojure:clojure
maven
1.0.0, 1.1.0, 1.2.0, 1.2.1 (+111 more)1.9.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2017-20189?
Clojure classes can be used to craft a serialized object that runs arbitrary code on deserialization This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2017-20189?
CVE-2017-20189 affects org.clojure:clojure. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2017-20189 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-jgxc-8mwq-9xqw

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