Overview
The Common Vulnerabilities and Exposures system has recently identified a significant vulnerability, CVE-2025-41235, that affects the Spring Cloud Gateway Server. This vulnerability relates to the forwarding of X-Forwarded-For and Forwarded headers from untrusted proxies. The potential risk here is that this could lead to system compromise or even data leakage, affecting not only the integrity of the system but potentially the confidentiality of sensitive data as well. Given the severity of this vulnerability, it’s critical for developers and systems administrators to understand its implications and apply appropriate mitigations promptly.
Vulnerability Summary
CVE ID: CVE-2025-41235
Severity: High – CVSS 8.6
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
Spring Cloud Gateway Server | All versions prior to patch
How the Exploit Works
The vulnerability CVE-2025-41235 arises from the Spring Cloud Gateway Server’s improper handling of HTTP headers. Specifically, it forwards the X-Forwarded-For and Forwarded headers from untrusted proxies without validation. Attackers can exploit this vulnerability by manipulating these headers in the HTTP requests sent via a proxy. This could potentially allow an attacker to compromise the system or cause data leakage.
Conceptual Example Code
Here’s a conceptual example of how an HTTP request exploiting this vulnerability might look like:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
X-Forwarded-For: malicious.ip.address
Forwarded: for=malicious.ip.address
Content-Type: application/json
{ "malicious_payload": "..." }In this example, the X-Forwarded-For and Forwarded headers are manipulated to include a malicious IP address. The server, trusting these headers, could potentially process the request in a way that compromises the system or leaks data.