{"id":"CVE-2017-20189","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-20189","generatedAt":"2026-10-29T00:33:27.360Z","title":"In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization.","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.","published":"2024-01-22T06:15:08.000Z","lastModified":"2026-06-17T01:15:22.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-502"],"affected":["clojure/clojure"],"epss":{"score":0.01332,"percentile":0.70939,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://clojure.atlassian.net/browse/CLJ-2204","tags":["Exploit","Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://github.com/frohoff/ysoserial/pull/68/files","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://hackmd.io/%40fe1w0/HyefvRQKp","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://clojure.atlassian.net/browse/CLJ-2204","tags":["Exploit","Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/frohoff/ysoserial/pull/68/files","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackmd.io/%40fe1w0/HyefvRQKp","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20241108-0002/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-20189","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}