Applications that configure their broker connection via RabbitConnectionFactoryBean.setUri("amqps://...") without also calling setUseSSL(true) get TLS encryption with no certificate validation and no hostname verification.
Affected versions: Spring AMQP 4.0.0 through 4.0.3; 3.2.0 through 3.2.10; 3.1.0 through 3.1.15; 2.4.0 through 2.4.17.
Exploitability
AV:NAC:HPR:NUI:NScope
S:CImpact
C:LI:NA:N4/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:NCryptography