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Vulnerability of Cisco ESA: bypassing via MIME

Synthesis of the vulnerability 

An attacker can send a malformed MIME header, in order to bypass the filter of Cisco ESA.
Impacted products: AsyncOS, Cisco ESA.
Severity of this bulletin: 2/4.
Creation date: 17/11/2016.
Références of this threat: cisco-sa-20161116-esa1, CSCva13456, CVE-2016-6462, VIGILANCE-VUL-21147.

Description of the vulnerability 

An attacker can send a malformed MIME header, in order to bypass the filter of Cisco ESA.
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This computer threat bulletin impacts software or systems such as AsyncOS, Cisco ESA.

Our Vigil@nce team determined that the severity of this security threat is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer vulnerability alert.

Solutions for this threat 

Cisco ESA: solution CSCva13456.
The solution is described on the Cisco site:
  https://tools.cisco.com/bugsearch/bug/CSCva13456
  https://tools.cisco.com/quickview/bug/CSCva13456
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