cisco-sa-20191120-esa-url-bypass: Cisco Email Security Appliance URL Filtering Bypass Vulnerability
First published: Wed Nov 20 2019(Updated: )
A vulnerability in the antispam protection mechanisms 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. The vulnerability is due to insufficient input validation of URLs. An attacker could exploit this vulnerability by crafting the URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for the affected device, which could allow malicious URLs to pass through the device. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-esa-url-bypass
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware | ||
| Cisco AsyncOS Software |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20191120-esa-url-bypass?
The vulnerability cisco-sa-20191120-esa-url-bypass is considered to have a high severity due to its potential to allow URL reputation filter bypass.
How do I fix cisco-sa-20191120-esa-url-bypass?
To fix cisco-sa-20191120-esa-url-bypass, upgrade your Cisco Email Security Appliance to a version that addresses this vulnerability.
Who is affected by cisco-sa-20191120-esa-url-bypass?
Organizations using Cisco Email Security Appliance or Cisco AsyncOS Software are affected by the cisco-sa-20191120-esa-url-bypass vulnerability.
What could an attacker achieve with cisco-sa-20191120-esa-url-bypass?
An attacker could bypass the URL reputation filters on affected Cisco devices, potentially leading to further exploitation.
When was cisco-sa-20191120-esa-url-bypass disclosed?
The cisco-sa-20191120-esa-url-bypass vulnerability was disclosed on November 20, 2019.
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