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CVE-2025-48865— Fabio allows HTTP clients to manipulate custom headers it adds

Quick assessment

Affected
fabiolb fabio
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fabio是Fabio开源的一款应用程序。 Fabio 1.6.6之前版本存在安全漏洞，该漏洞源于处理逐跳标头时允许客户端移除X-Forwarded标头，可能导致安全漏洞。

CVSS 9.1 · Critical EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2025-48865

Vulnerability Information
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Vulnerability Title
Fabio allows HTTP clients to manipulate custom headers it adds
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Fabio 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fabio是Fabio开源的一款应用程序。 Fabio 1.6.6之前版本存在安全漏洞，该漏洞源于处理逐跳标头时允许客户端移除X-Forwarded标头，可能导致安全漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
fabiolb fabio < 1.6.6 -

II. Public POCs for CVE-2025-48865

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12191 chars
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III. Intelligence Information for CVE-2025-48865

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Vendor Advisories for CVE-2025-48865 (1)

IV. Related Vulnerabilities

Same product: fabio
Same vendor: fabiolb
Same weakness: CWE-345

V. Comments for CVE-2025-48865

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