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Vulnerability of Cisco Email Security Appliance: infinite loop via URL Filtering

Synthesis of the vulnerability 

An attacker can trigger an infinite loop via URL Filtering of Cisco Email Security Appliance, in order to trigger a denial of service.
Impacted software: AsyncOS, Cisco ESA.
Severity of this computer vulnerability: 3/4.
Creation date: 10/01/2019.
Références of this announce: CERTFR-2019-AVI-012, cisco-sa-20190109-esa-url-dos, CSCvm81627, CVE-2018-15460, VIGILANCE-VUL-28204.

Description of the vulnerability 

An attacker can trigger an infinite loop via URL Filtering of Cisco Email Security Appliance, in order to trigger a denial of service.
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This vulnerability alert impacts software or systems such as AsyncOS, Cisco ESA.

Our Vigil@nce team determined that the severity of this computer weakness alert 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 computer vulnerability.

Solutions for this threat 

Cisco Email Security Appliance: solution CSCvm81627.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm81627
  https://tools.cisco.com/bugsearch/bug/CSCvm81627
  https://tools.cisco.com/quickview/bug/CSCvm81627
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