CVE-2023-20863 is a medium-severity vulnerability affecting certain versions of the Spring Framework. This security issue, known as a denial-of-service (DoS) vulnerability, can be exploited by providing a specially crafted SpEL expression. The affected systems include Spring Framework versions prior to 5.2.24 release+, 5.3.27+, and 6.0.8+. To mitigate this vulnerability, users are advised to upgrade to the appropriate fixed versions of the framework.

How do I know if I'm affected?

To determine if you're affected by the CVE-2023-20863 vulnerability, check if you're using any of the following Spring Framework versions: 5.2.0 to 5.2.23, 5.3.0 to 5.3.26, or 6.0.0 to 6.0.7. Older, unsupported versions may also be affected. This vulnerability allows a user to provide a specially crafted SpEL expression that can cause a denial-of-service (DoS) condition. If you're using one of these versions, it's important to be aware of this issue and take necessary precautions.

What should I do if I'm affected?

If you're affected by the this vulnerability, follow these simple steps to protect your system: Identify your Spring Framework version, upgrade to the fixed version 6.0.8+ for 6.0.x users, 5.3.27+ for 5.3.x users, or 5.2.24.RELEASE+ for 5.2.x users, and if using an older unsupported version, upgrade to 6.0.8+ or 5.3.27+. No other steps are necessary.

Is this in CISA’s Known Exploited Vulnerabilities Catalog?

The CVE-2023-20863 vulnerability is not listed in CISA's Known Exploited Vulnerabilities Catalog. This medium-severity issue affects certain versions of the Spring Framework and can cause a denial-of-service (DoS) condition when a specially crafted SpEL expression is provided. To protect your system, upgrade to the appropriate fixed version of the framework.

Weakness enumeration

The weakness enumeration for this vulnerability is categorized into two : CWE-917 improper neutralization of special elements in an expression language statement and CWE-400 uncontrolled resource consumption.

For more details

For a comprehensive understanding of this vulnerability, including its description, severity, technical details, and known affected software configurations, refer to the NVD or the links below.

• Spring Security Advisories