CVE-2025-66415— fastify-reply-from bypass of reply forwarding
Quick assessment
Affected
fastify fastify-reply-from
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Fastify是Fastify开源的一个 Web 框架。 Fastify存在安全漏洞，该漏洞源于攻击者可构造恶意URL访问未授权路由，可能导致越权访问。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2025-66415
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
fastify-reply-from bypass of reply forwarding
Source: CVE Program / CVE List V5
Vulnerability Description
fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the reply.from is defined for specific routes in @fastify/reply-from. This vulnerability is fixed in 12.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify是Fastify开源的一个 Web 框架。 Fastify存在安全漏洞，该漏洞源于攻击者可构造恶意URL访问未授权路由，可能导致越权访问。
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 |
|---|---|---|---|---|
| fastify | fastify-reply-from | < 12.5.0 | - |
|
II. Public POCs for CVE-2025-66415
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2025-66415
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same vendor: fastify
-
CVE-2026-92081
fastify vulnerable to Denial of Service via unhandled except -
CVE-2026-84428
fastify vulnerable to header validation bypass via incomplet -
CVE-2026-84469
fastify vulnerable to request validation bypass via skipped -
CVE-2026-76169
fastify vulnerable to authentication bypass via malformed UR -
CVE-2026-84504
fastify vulnerable to request body replacement via an async
Same weakness: CWE-441
-
CVE-2026-95328
Android版Chrome 154前混淆代理致信息泄露 -
CVE-2026-95361
Chrome 154.0.8037.57 前DevTools源策略绕过 -
CVE-2026-101907
Axios: maxRedirects: 0 is not enforced by the fetch adapter, -
CVE-2026-101905
Axios: Node HTTP adapter prototype-pollution gadget allows r -
CVE-2026-72668
Unintended Proxy or Intermediary ('Confused Deputy') in Kiba
V. Comments for CVE-2025-66415
No comments yet