// For flags

CVE-2018-0447

Cisco Email Security Appliance URL Filtering Bypass Vulnerability

Severity Score

5.3
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A vulnerability in the anti-spam protection mechanisms of Cisco AsyncOS Software for the Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass certain content filters on an affected device. The vulnerability is due to incomplete input and validation checking mechanisms for certain Sender Policy Framework (SPF) messages that are sent to an affected device. An attacker could exploit this vulnerability by sending a customized SPF packet to an affected device. If successful, an exploit could allow the attacker to bypass the URL filters that are configured for the affected device, which could allow malicious URLs to pass through the device.

Una vulnerabilidad en los mecanismos de protección anti-spam de Cisco AsyncOS Software para Cisco Email Security Appliance (ESA) podría permitir que un atacante remoto no autenticado omita determinados filtros de contenido en un dispositivo afectado. Esta vulnerabilidad se debe a mecanismos de comprobación de validación y entradas incompletos para determinados mensajes SPF (Sender Policy Framework) que se envíen a un dispositivo afectado. Un atacante podría explotar esta vulnerabilidad enviando un paquete SPF personalizado a un dispositivo afectado. Si se realiza con éxito, su explotación podría permitir que el atacante omita los filtros URL que están configurados para el dispositivo afectado, lo que podría permitir que las URL maliciosas pasen a través del dispositivo.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2017-11-27 CVE Reserved
  • 2018-10-05 CVE Published
  • 2024-06-20 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-284: Improper Access Control
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"
 Email Security Appliance
Search vendor "Cisco" for product "Email Security Appliance"
--
Affected