Cisco Security Advisory - Cisco Email Security Appliance URL Filtering Bypass Vulnerability

[Netwörkheäd]

Cisco Email Security Appliance URL Filtering Bypass Vulnerability

On January 18, 2023, Cisco disclosed the following:

A vulnerability in the URL filtering mechanism of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device.

This vulnerability is due to improper processing of URLs. An attacker could exploit this vulnerability by crafting a URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.

After additional investigation, it was determined that this vulnerability is not exploitable. For more information, see the Workarounds section of this advisory.

This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-url-bypass-WbMQqNJh

     
         
Security Impact Rating:  Informational
   
   
       
CVE: CVE-2023-20057
Source: Cisco Email Security Appliance URL Filtering Bypass Vulnerability