In Spring Boot versions 2.7.0 - 2.7.17, 3.0.0-3.0.12 and 3.1.0-3.1.5, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

the application uses Spring MVC or Spring WebFlux org.springframework.boot:spring-boot-actuator is on the classpath

In Spring Boot versions 3.0.0 - 3.0.5, 2.7.0 - 2.7.10, 2.6.0 - 2.6.14, 2.5.0 - 2.5.14 and older unsupported versions, an application that is deployed to Cloud Foundry could be susceptible to a security bypass.

References:

https://spring.io/security/cve-2023-20873 https://github.com/spring-projects/spring-boot/commit/307f3c339912466e78fcdac648fff95a4edea573 https://github.com/spring-projects/spring-boot/commit/3522714c13b47af03bf42e7f2d5994af568cb1a7 https://github.com/spring-projects/spring-boot/issues/35085 https://github.com/spring-projects/spring-boot/releases/tag/v2.7.11

In Spring Boot versions 3.0.0 - 3.0.6, 2.7.0 - 2.7.11, 2.6.0 - 2.6.14, 2.5.0 - 2.5.14 and older unsupported versions, there is potential for a denial-of-service (DoS) attack if Spring MVC is used together with a reverse proxy cache.

Spring Boot's Cassandra auto-configuration does not perform hostname verification when establishing an SSL connection to Cassandra.

Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); Cassandra SSL auto-configuration. Versions that are no longer supported are also affected per vendor advisory.