Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should trust these headers, allowing HTTP clients to remove or modify them creates potential security vulnerabilities. Some of these custom headers can be removed and, in certain cases, manipulated. The attack relies on the behavior that headers can be defined as hop-by-hop via the HTTP Connection header. This issue has been patched in version 1.6.6.
                
            Metrics
Affected Vendors & Products
References
        History
                    Fri, 11 Jul 2025 13:45:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| Metrics | epss 
 | epss 
 | 
Wed, 04 Jun 2025 20:15:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| First Time appeared | Fabiolb Fabiolb fabio | |
| CPEs | cpe:2.3:a:fabiolb:fabio:*:*:*:*:*:go:*:* | |
| Vendors & Products | Fabiolb Fabiolb fabio | 
Fri, 30 May 2025 13:15:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| Metrics | ssvc 
 | 
Fri, 30 May 2025 06:30:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| Description | Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should trust these headers, allowing HTTP clients to remove or modify them creates potential security vulnerabilities. Some of these custom headers can be removed and, in certain cases, manipulated. The attack relies on the behavior that headers can be defined as hop-by-hop via the HTTP Connection header. This issue has been patched in version 1.6.6. | |
| Title | Fabio allows HTTP clients to manipulate custom headers it adds | |
| Weaknesses | CWE-345 CWE-348 | |
| References |  | |
| Metrics | cvssV3_1 
 | 
 MITRE
                        MITRE
                    Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-05-30T12:24:19.086Z
Reserved: 2025-05-27T20:14:34.294Z
Link: CVE-2025-48865
 Vulnrichment
                        Vulnrichment
                    Updated: 2025-05-30T12:24:03.593Z
 NVD
                        NVD
                    Status : Analyzed
Published: 2025-05-30T07:15:23.940
Modified: 2025-06-04T19:54:41.613
Link: CVE-2025-48865
 Redhat
                        Redhat
                    No data.