What’s Vulnerable › Vulnerabilities

CVE-2017-20189

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-22 · updated 2026-06-17
• Weakness: CWE-502

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.

Affected products

• Clojure: before 1.9.0 — fixed in 1.9.0

How to fix

Upgrade to a fixed version: Clojure 1.9.0. Check the vendor advisory for mitigations.

References

• https://clojure.atlassian.net/browse/CLJ-2204
• https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3
• https://github.com/frohoff/ysoserial/pull/68/files
• https://hackmd.io/%40fe1w0/HyefvRQKp
• https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378
• https://clojure.atlassian.net/browse/CLJ-2204
• https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3
• https://github.com/frohoff/ysoserial/pull/68/files
• https://hackmd.io/%40fe1w0/HyefvRQKp
• https://security.netapp.com/advisory/ntap-20241108-0002/
• https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378

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