CVE-2025-67731— Servify Express does not enforce rate limiting when parsing JSON
Quick assessment
Affected
Aarondoran servify-express
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.
Servify Express是Aaron doran个人开发者的一个快递包裹表单服务器。 Servify Express 1.2之前版本存在资源管理错误漏洞，该漏洞源于Express服务器未设置JSON解析大小限制，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-67731
Vulnerability Information
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Vulnerability Title
Servify Express does not enforce rate limiting when parsing JSON
Source: CVE Program / CVE List V5
Vulnerability Description
Servify Express is a Node.js package to start an Express server and log the port it's running on. Prior to 1.2, the Express server used express.json() without a size limit, which could allow attackers to send extremely large request bodies. This can cause excessive memory usage, degraded performance, or process crashes, resulting in a Denial of Service (DoS). Any application using the JSON parser without limits and exposed to untrusted clients is affected. The issue is not a flaw in Express itself, but in configuration. This issue is fixed in version 1.2. To work around, consider adding a limit option to the JSON parser, rate limiting at the application or reverse-proxy level, rejecting unusually large requests before parsing, or using a reverse proxy (such as NGINX) to enforce maximum request body sizes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Servify Express 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Servify Express是Aaron doran个人开发者的一个快递包裹表单服务器。 Servify Express 1.2之前版本存在资源管理错误漏洞，该漏洞源于Express服务器未设置JSON解析大小限制，可能导致拒绝服务攻击。
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 |
|---|---|---|---|---|
| Aarondoran | servify-express | < 1.2 | - |
|
II. Public POCs for CVE-2025-67731
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-67731 (1)
Vendor Advisories for CVE-2025-67731 (1)
Other References for CVE-2025-67731 (1)
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https://github.com/Aarondoran/servify-express/releases/tag/V1.2 x_refsource_MISC
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V. Comments for CVE-2025-67731
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