CVE-2023-20883

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-26 · updated 2026-06-17
Weakness: CWE-400

Description

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.

Affected products

Spring Boot: before 2.5.14; from 2.6.0 through 2.6.14; from 2.7.0 through 2.7.11; from 3.0.0 through 3.0.6 — fixed in 2.5.14
Spring Boot: from Spring Boot versions 3.0.0 through 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

How to fix

Upgrade to a fixed version: Spring Boot 2.5.14. Check the vendor advisory for mitigations.

References

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