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I. Basic Information for CVE-2021-21328
Vulnerability Information

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Vulnerability Title
Denial of Service
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vapor is a web framework for Swift. In Vapor before version 4.40.1, there is a DoS attack against anyone who Bootstraps a metrics backend for their Vapor app. The following is the attack vector: 1. send unlimited requests against a vapor instance with different paths. this will create unlimited counters and timers, which will eventually drain the system. 2. downstream services might suffer from this attack as well by being spammed with error paths. This has been patched in 4.40.1. The `DefaultResponder` will rewrite any undefined route paths for to `vapor_route_undefined` to avoid unlimited counters.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
vapor 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vapor是个人开发者的一个 Swift 的 Web 开发框架。可用于开发高性能的Web应用,支持 iOS、OS X 和 Ubuntu 系统。 Vapor before version 4.40. 存在安全漏洞,攻击者可利用该漏洞发起DoS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
VendorProductAffected VersionsCPESubscribe
vaporvapor <= 4.40.0 -
II. Public POCs for CVE-2021-21328
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III. Intelligence Information for CVE-2021-21328
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IV. Related Vulnerabilities
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