# CVE-2017-20189: clojure: In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deser...

CVE-2017-20189 is fixed in clojure on 1 platform, first by DEBIAN-CVE-2017-20189, released January 22, 2024. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2017-20189
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0133
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 22, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | clojure Debian 12.15 (bookworm) | 1.9.0-1 | [DEBIAN-CVE-2017-20189](https://patchblox.com/security/data/fix/linux/debian-cve-2017-20189.md) | Jan 22, 2024 |
| Linux | clojure Debian 13.5 (trixie) | 1.9.0-1 | [DEBIAN-CVE-2017-20189](https://patchblox.com/security/data/fix/linux/debian-cve-2017-20189.md) | Jan 22, 2024 |
| Linux | clojure Debian 14 | 1.9.0-1 | [DEBIAN-CVE-2017-20189](https://patchblox.com/security/data/fix/linux/debian-cve-2017-20189.md) | Jan 22, 2024 |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo