CVE-2017-20189: clojure Deserialization of Untrusted Data
Vulnerability summary
CVE-2017-20189 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in clojure. EPSS estimates a 1.33% chance of exploitation in the next 30 days, higher than 71.1% of scored vulnerabilities. 2 public exploits are recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Timeline
- 22-01-2024PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 5 sources · 1 version- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · MavenEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.33%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.33% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
2 foundExploit Reference (hackmd.io)
Maturity: unknown
Exploit Reference (clojure.atlassian.net)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Clojure1 product
- clojure< 1.9.0
Debian1 product
- clojure< 1.9.0-1
Org.clojure1 product
- clojure< 1.9.0
Ubuntu1 product
- clojureAll versions (No fix recorded)
4 vendors · 4 products
References
13 links
Show all 13 references
- github.com/clojure/clojurePACKAGE