{"cve":"CVE-2017-3203","nvd":{"published":"2018-06-11T17:29:00.680","modified":"2026-06-17T01:17:43.690","status":"Modified","description":"The Java implementations of AMF3 deserializers in Pivotal/Spring Spring-flex derive class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A remote attacker with the ability to spoof or control an RMI server connection may be able to send serialized Java objects that execute arbitrary code when deserialized.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-502"],"references":["http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution","https://codewhitesec.blogspot.com/2017/04/amf.html","https://www.kb.cert.org/vuls/id/307983","https://www.securityfocus.com/bid/97376","http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution"],"products":["pivotal:spring-flex"],"source":"nvd","synced_at":"2026-10-19T20:50:40.212176939+00:00"},"epss":{"cve":"CVE-2017-3203","score":0.06229,"percentile":0.93539,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8v4h-j42h-wfhc","url":"https://osv.dev/vulnerability/GHSA-8v4h-j42h-wfhc","summary":"Deserialization of Untrusted Data in Spring-flex","modified":"2023-11-08T03:59:21.022673Z","packages":[{"ecosystem":"Maven","name":"org.springframework.flex:spring-flex","purl":"pkg:maven/org.springframework.flex/spring-flex","ranges":["<=1.5.2.RELEASE"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}