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                            CERT-Renater

                Note d'Information No. 2025/VULN706
_____________________________________________________________________

DATE                : 16/10/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Spring Cloud Gateway versions
                        prior to 4.3.2, 4.2.6, 4.1.12, 3.1.12.

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https://spring.io/security/cve-2025-41253/
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CVE-2025-41253: Using Spring Expression Language To Expose Environment
Variables and System Properties
MODERATE | OCTOBER 15, 2025 | CVE-2025-41253


Description

The following versions of Spring Cloud Gateway Server Webflux may be
vulnerable to the ability to expose environment variables and system
properties to attackers.

An application should be considered vulnerable when all the following
are true:

    The application is using Spring Cloud Gateway Server Webflux
(Spring Cloud Gateway Server WebMVC is not vulnerable).

    An admin or untrusted third party using Spring Expression Language
(SpEL) to access environment variables or system properties via routes.

    An untrusted third party could create a route that uses SpEL to
access environment variables or system properties if:
        The Spring Cloud Gateway Server Webflux actuator web endpoint
          is enabled via
          management.endpoints.web.exposure.include=gateway and
          management.endpoint.gateway.enabled=true or
          management.endpoint.gateway.access=unrestricte.
        The actuator endpoints are available to attackers.
        The actuator endpoints are unsecured.


Affected Spring Products and Versions

Spring Cloud Gateway:

    4.3.0 - 4.3.x
    4.2.0 - 4.2.x
    4.1.0 - 4.1.x
    4.0.0 - 4.0.x
    3.1.0 - 3.1.x
    Older, unsupported versions are also affected.


Mitigation

Users of affected versions should upgrade to the corresponding
fixed version.


Affected version(s) 	Fix version 	Availability
4.3.x 	4.3.2 	OSS
4.2.x 	4.2.6 	OSS
4.1.x 	4.1.12 	Commercial
4.0.x 	4.1.12 	Out of support
3.1.x 	3.1.12 	Commercial


No further mitigation steps are necessary.


If you cannot upgrade, then you can:

    Remove gateway from the management.endpoints.web.exposure.include
property or secure the actuator endpoints.


Credit

This issue was responsibly reported by psytester.


References

    https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N&version=3.1


History

    2025-10-15: Initial vulnerability report published.


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