cisco-sa-esa-url-bypass-WO4BZ75s: Cisco Email Security Appliance URL Filtering Bypass Vulnerability
First published: Wed Jun 17 2020(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. Cisco has released software updates that address this vulnerability. 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-esa-url-bypass-WO4BZ75s
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Email Security Appliance Firmware |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-esa-url-bypass-WO4BZ75s?
The severity of cisco-sa-esa-url-bypass-WO4BZ75s is classified as high due to the potential for unauthenticated remote attackers to bypass URL reputation filters.
How do I fix cisco-sa-esa-url-bypass-WO4BZ75s?
To fix cisco-sa-esa-url-bypass-WO4BZ75s, it is recommended to update the Cisco Email Security Appliance to the latest firmware that addresses this vulnerability.
Who is affected by cisco-sa-esa-url-bypass-WO4BZ75s?
Organizations using Cisco Email Security Appliance running vulnerable versions of AsyncOS software are affected by cisco-sa-esa-url-bypass-WO4BZ75s.
What can attackers do with cisco-sa-esa-url-bypass-WO4BZ75s?
Attackers exploiting cisco-sa-esa-url-bypass-WO4BZ75s can bypass critical URL reputation filters, potentially allowing malicious URLs to pass through undetected.
Is there a workaround for cisco-sa-esa-url-bypass-WO4BZ75s?
Currently, there are no documented workarounds for cisco-sa-esa-url-bypass-WO4BZ75s, making an update the primary mitigation method.
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