// For flags

CVE-2021-40126

Cisco Umbrella Email Enumeration Vulnerability

Severity Score

4.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in the web-based dashboard of Cisco Umbrella could allow an authenticated, remote attacker to perform an email enumeration attack against the Umbrella infrastructure. This vulnerability is due to an overly descriptive error message on the dashboard that appears when a user attempts to modify their email address when the new address already exists in the system. An attacker could exploit this vulnerability by attempting to modify the user's email address. A successful exploit could allow the attacker to enumerate email addresses of users in the system.

Una vulnerabilidad en el panel de control basado en la web de Cisco Umbrella podría permitir a un atacante remoto y autenticado llevar a cabo un ataque de enumeración de correos electrónicos contra la infraestructura de Umbrella. Esta vulnerabilidad es debido a un mensaje de error demasiado descriptivo en el panel de control que aparece cuando un usuario intenta modificar su dirección de correo electrónico cuando la nueva dirección ya se presenta en el sistema. Un atacante podría explotar esta vulnerabilidad al intentar modificar la dirección de correo electrónico del usuario. Una explotación con éxito podría permitir al atacante enumerar las direcciones de correo electrónico de usuarios en el sistema

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-08-25 CVE Reserved
  • 2021-11-04 CVE Published
  • 2023-05-28 EPSS Updated
  • 2024-11-07 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-209: Generation of Error Message Containing Sensitive Information
  • CWE-210: Self-generated Error Message Containing Sensitive Information
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
Umbrella
Search vendor "Cisco" for product "Umbrella"
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Affected