CVE-2017-3203: Pivotal Spring-Flex

High severity, CVSS 8.1. EPSS: 6.3% chance of exploitation in the next 30 days.

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.

Affected products

• Pivotal Spring-Flex: any version

Published 2018-06-11. Last modified 2026-06-17.