// For flags

CVE-2021-27292

nodejs-ua-parser-js: ReDoS via malicious User-Agent header

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.

ua-parser-js versiones posteriores incluyendo a 0.7.14, corregido en 0.7.24, usa una expresión regular que es vulnerable a una denegación de servicio. Si un atacante envía un encabezado User-Agent malicioso, ua-parser-js se bloqueará al procesarlo durante un período de tiempo prolongado

A regular expression denial of service (ReDoS) vulnerability was found in the npm library `ua-parser-js`. If a supplied user agent matches the `Noble` string and contains many spaces then the regex will conduct backtracking, taking an ever increasing amount of time depending on the number of spaces supplied. An attacker can use this vulnerability to potentially craft a malicious user agent resulting in a denial of service.

*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
  • 2021-02-16 CVE Reserved
  • 2021-03-17 CVE Published
  • 2023-12-01 EPSS Updated
  • 2024-08-03 CVE Updated
  • 2024-08-03 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
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
Ua-parser-js Project
Search vendor "Ua-parser-js Project"
 Ua-parser-js
Search vendor "Ua-parser-js Project" for product "Ua-parser-js"
 >= 0.7.14 < 0.7.24
Search vendor "Ua-parser-js Project" for product "Ua-parser-js" and version " >= 0.7.14 < 0.7.24"
node.js
Affected