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Cisco Bug: CSCvv91815 - Bypass URL Filtering by modifying HTML of email and inserting as text

Last Modified

Oct 05, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases


Description (partial)

When taking an email with a malicious URL and modifying the HTML of the message to include a different URL and then attaching the new HTML to the email as text, it is possible to bypass a catchall URL filtering policy for -10 to 10.

The appliance must have a catch all content filter to defang all URLS  in an email with a score between -10 to 10.
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