// For flags

CVE-2021-1566

Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability

Severity Score

7.4
*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 Cisco Advanced Malware Protection (AMP) for Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance (ESA) and Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to intercept traffic between an affected device and the AMP servers. This vulnerability is due to improper certificate validation when an affected device establishes TLS connections. A man-in-the-middle attacker could exploit this vulnerability by sending a crafted TLS packet to an affected device. A successful exploit could allow the attacker to spoof a trusted host and then extract sensitive information or alter certain API requests.

Una vulnerabilidad en la integración de Cisco Advanced Malware Protection (AMP) for Endpoints de Cisco AsyncOS para Cisco Email Security Appliance (ESA) y Cisco Web Security Appliance (WSA) podría permitir a un atacante remoto no autenticado interceptar el tráfico entre un dispositivo afectado y los servidores AMP. Esta vulnerabilidad es debido a una comprobación inapropiada del certificado cuando un dispositivo afectado establece conexiones TLS. Un atacante tipo "man-in-the-middle" podría explotar esta vulnerabilidad mediante el envio de un paquete TLS diseñado a un dispositivo afectado. Una explotación con éxito podría permitir al atacante falsificar un host confiable y luego extraer información confidencial o alterar determinadas peticiones de la API

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2020-11-13 CVE Reserved
  • 2021-06-16 CVE Published
  • 2024-06-19 EPSS Updated
  • 2024-11-07 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-295: Improper Certificate Validation
  • CWE-296: Improper Following of a Certificate's Chain of Trust
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
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Email Security Appliance
Search vendor "Cisco" for product "Email Security Appliance"
--
Affected
Cisco
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Asyncos
Search vendor "Cisco" for product "Asyncos"
< 12.5.3-035
Search vendor "Cisco" for product "Asyncos" and version " < 12.5.3-035"
-
Affected
Cisco
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Email Security Appliance
Search vendor "Cisco" for product "Email Security Appliance"
--
Affected
Cisco
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Asyncos
Search vendor "Cisco" for product "Asyncos"
>= 13.0 < 13.0.0-030
Search vendor "Cisco" for product "Asyncos" and version " >= 13.0 < 13.0.0-030"
-
Affected
Cisco
Search vendor "Cisco"
Email Security Appliance
Search vendor "Cisco" for product "Email Security Appliance"
--
Affected
Cisco
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Asyncos
Search vendor "Cisco" for product "Asyncos"
>= 13.5 < 13.5.3-010
Search vendor "Cisco" for product "Asyncos" and version " >= 13.5 < 13.5.3-010"
-
Affected
Cisco
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Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
--
Affected
Cisco
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Asyncos
Search vendor "Cisco" for product "Asyncos"
< 11.8.3-021
Search vendor "Cisco" for product "Asyncos" and version " < 11.8.3-021"
-
Affected
Cisco
Search vendor "Cisco"
Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
--
Affected
Cisco
Search vendor "Cisco"
Asyncos
Search vendor "Cisco" for product "Asyncos"
>= 12.0.0 < 12.0.3-005
Search vendor "Cisco" for product "Asyncos" and version " >= 12.0.0 < 12.0.3-005"
-
Affected
Cisco
Search vendor "Cisco"
Web Security Appliance
Search vendor "Cisco" for product "Web Security Appliance"
--
Affected
Cisco
Search vendor "Cisco"
Asyncos
Search vendor "Cisco" for product "Asyncos"
>= 12.5.0 < 12.5.1-043
Search vendor "Cisco" for product "Asyncos" and version " >= 12.5.0 < 12.5.1-043"
-
Affected