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Vulnerability of Cisco Email Security Appliance: memory corruption via S/MIME

Synthesis of the vulnerability 

An attacker can trigger a memory corruption via S/MIME of Cisco Email Security Appliance, in order to trigger a denial of service, and possibly to run code.
Impacted products: AsyncOS, Cisco ESA.
Severity of this bulletin: 3/4.
Creation date: 10/01/2019.
Références of this threat: CERTFR-2019-AVI-012, cisco-sa-20190109-esa-dos, CSCvk73786, CVE-2018-15453, VIGILANCE-VUL-28203.

Description of the vulnerability 

An attacker can trigger a memory corruption via S/MIME of Cisco Email Security Appliance, in order to trigger a denial of service, and possibly to run code.
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This security vulnerability impacts software or systems such as AsyncOS, Cisco ESA.

Our Vigil@nce team determined that the severity of this computer weakness bulletin is important.

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

An attacker with a expert ability can exploit this security note.

Solutions for this threat 

Cisco Email Security Appliance: solution CSCvk73786.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk73786
  https://tools.cisco.com/bugsearch/bug/CSCvk73786
  https://tools.cisco.com/quickview/bug/CSCvk73786
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