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CVE-2025-64484— OAuth2-Proxy vulnerable to header smuggling via underscore, leading to potential privilege escalation

Quick assessment

Affected
oauth2-proxy oauth2-proxy
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.

oauth2-proxy是OAuth2 Proxy开源的一个反向代理软件。 OAuth2-Proxy 7.13.0之前版本存在安全漏洞，该漏洞源于HTTP标头处理不当，可能导致权限提升。

CVSS 8.5 · High EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2025-64484

Vulnerability Information
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Vulnerability Title
OAuth2-Proxy vulnerable to header smuggling via underscore, leading to potential privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into existing reverse proxy or load balancer setups. In versions prior to 7.13.0, all deployments of OAuth2 Proxy in front of applications that normalize underscores to dashes in HTTP headers (e.g., WSGI-based frameworks such as Django, Flask, FastAPI, and PHP applications). Authenticated users can inject underscore variants of X-Forwarded-* headers that bypass the proxy’s filtering logic, potentially escalating privileges in the upstream app. OAuth2 Proxy authentication/authorization itself is not compromised. The problem has been patched with v7.13.0. By default all specified headers will now be normalized, meaning that both capitalization and the use of underscores (_) versus dashes (-) will be ignored when matching headers to be stripped. For example, both `X-Forwarded-For` and `X_Forwarded-for` will now be treated as equivalent and stripped away. For those who have a rational that requires keeping a similar looking header and not stripping it, the maintainers introduced a new configuration field for Headers managed through the AlphaConfig called `InsecureSkipHeaderNormalization`. As a workaround, ensure filtering and processing logic in upstream services don't treat underscores and hyphens in Headers the same way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对HTTP头部进行脚本语法转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OAuth2-Proxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
oauth2-proxy是OAuth2 Proxy开源的一个反向代理软件。 OAuth2-Proxy 7.13.0之前版本存在安全漏洞，该漏洞源于HTTP标头处理不当，可能导致权限提升。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
oauth2-proxy oauth2-proxy < 7.13.0 -

II. Public POCs for CVE-2025-64484

# POC Description Source Link Shenlong Link
1 CVE-2025-64484 https://github.com/B1ack4sh/Blackash-CVE-2025-64484 POC Details
2 CVE-2025-64484 https://github.com/Ashwesker/Blackash-CVE-2025-64484 POC Details
3 CVE-2025-64484 https://github.com/Ashwesker/Ashwesker-CVE-2025-64484 POC Details
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III. Intelligence Information for CVE-2025-64484

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Vendor Advisories for CVE-2025-64484 (1)

Other References for CVE-2025-64484 (1)

IV. Related Vulnerabilities

Same product: oauth2-proxy
Same vendor: oauth2-proxy
Same weakness: CWE-644

V. Comments for CVE-2025-64484

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