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Cisco Bug: CSCvq66135 - Cisco Email Security Appliance Content Filter Bypass Vulnerability

Last Modified

May 05, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

12.5.0-066

Description (partial)

Symptom:
A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured filters on the device.

The vulnerability is due to improper validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email message to a recipient protected by the ESA. A successful exploit could allow the attacker to bypass the configured content filters, which could allow malicious content 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-bypass-5Cdv2HMA

Conditions:
At the time of publication, this vulnerability affected Cisco ESA releases earlier than 13.0.

At the time of publication, Cisco ESA releases 13.0 and later contained the fix for this vulnerability.
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