// For flags

CVE-2020-7662

npmjs-websocket-extensions: ReDoS vulnerability in Sec-WebSocket-Extensions parser

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

4
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.

El módulo de npm websocket-extensions versiones anteriores a 0.1.4 permite una denegación de servicio (DoS) por medio de Regex Backtracking. El analizador de extensiones puede tardar un tiempo cuadrático cuando analiza un encabezado que contiene un valor de parámetro de cadena no cerrado cuyo contenido es una secuencia repetitiva de dos bytes de una barra diagonal inversa y algún otro carácter. Esto podría ser abusado por un atacante para llevar a cabo una Denegación de Servicio de Regex (ReDoS) en un servidor de un subproceso único al proporcionar una carga útil maliciosa con el encabezado Sec-WebSocket-Extensions

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
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
  • 2020-01-21 CVE Reserved
  • 2020-05-14 First Exploit
  • 2020-06-02 CVE Published
  • 2023-12-29 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-20: Improper Input Validation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Websocket-extensions Project
Search vendor "Websocket-extensions Project"
 Websocket-extensions
Search vendor "Websocket-extensions Project" for product "Websocket-extensions"
 < 0.1.4
Search vendor "Websocket-extensions Project" for product "Websocket-extensions" and version " < 0.1.4"
node.js
Affected