CVE-2023-34055: Spring Boot server Web Observations DoS Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-28 · updated 2026-06-17

Description

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

Affected products

Spring Boot: from 2.7.0 through 2.7.17; from 3.0.0 through 3.0.12; from 3.1.0 through 3.1.5
Spring Boot: from 2.7.0 before 2.7.18; from 3.0.0 before 3.0.13; from 3.1.0 before 3.1.6; older unsupported versions — fixed in 2.7.18, 3.0.13, 3.1.6

How to fix

Upgrade to a fixed version: Spring Boot 2.7.18, 3.0.13, 3.1.6. Check the vendor advisory for mitigations.

References

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