CVE-2017-20189

Name: CVE-2017-20189
Creator: NVD / NIST
Published: 2024-01-22T06:15:07.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.32%

Last modified Jun 17, 2026

CVE-2017-20189 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.32% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.32%

67.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Clojure	Clojure	< 1.9.0

References

https://clojure.atlassian.net/browse/CLJ-2204Exploit, Patch, Vendor Advisory
https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3Patch
https://github.com/frohoff/ysoserial/pull/68/filesPatch
https://hackmd.io/%40fe1w0/HyefvRQKpExploit, Third Party Advisory
https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378Patch, Third Party Advisory
https://clojure.atlassian.net/browse/CLJ-2204Exploit, Patch, Vendor Advisory
https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3Patch
https://github.com/frohoff/ysoserial/pull/68/filesPatch
https://hackmd.io/%40fe1w0/HyefvRQKpExploit, Third Party Advisory
https://security.netapp.com/advisory/ntap-20241108-0002/
https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378Patch, Third Party Advisory

Timeline

Published: Jan 22, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-20189?

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.

How severe is CVE-2017-20189?

CVE-2017-20189 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.32% probability of exploitation in the next 30 days.

How do I fix CVE-2017-20189?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-20189?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST