// For flags

CVE-2021-21328

Denial of Service

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Vapor es un framework para Swift. En Vapor versiones anteriores a 4.40.1, se presenta un ataque DoS contra cualquiera que inicie un backend de métricas para su aplicación Vapor. El siguiente es el vector de ataque: 1. Enviar peticiones ilimitadas contra una instancia de vapor con diferentes rutas, esto creará contadores y temporizadores ilimitados, que eventualmente agotarán el sistema. 2. Los servicios aguas abajo también pueden sufrir este ataque al recibir spam con rutas de error. Esto ha sido parcheado en versión 4.40.1. El "DefaultResponder" reescribirá cualquier ruta de rutas no definida para "vapor_route_undefined" para evitar contadores ilimitados

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-22 CVE Reserved
  • 2021-02-26 CVE Published
  • 2023-11-11 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Vapor Project
Search vendor "Vapor Project"
 Vapor
Search vendor "Vapor Project" for product "Vapor"
 < 4.40.1
Search vendor "Vapor Project" for product "Vapor" and version " < 4.40.1"
swift
Affected