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Vulnerability of Cisco Web Security Appliance: denial of service via Device Reset

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Device Reset of Cisco Web Security Appliance, in order to trigger a denial of service.
Impacted products: AsyncOS, Cisco WSA.
Severity of this bulletin: 2/4.
Creation date: 07/11/2019.
Références of this threat: CERTFR-2019-AVI-548, cisco-sa-20191106-wsa-unauth-devreset, CSCvp51493, CVE-2019-15956, VIGILANCE-VUL-30807.

Description of the vulnerability 

An attacker can trigger a fatal error via Device Reset of Cisco Web Security Appliance, in order to trigger a denial of service.
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This security note impacts software or systems such as AsyncOS, Cisco WSA.

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

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

An attacker with a expert ability can exploit this computer weakness announce.

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvp51493.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp51493
  https://tools.cisco.com/bugsearch/bug/CSCvp51493
  https://tools.cisco.com/quickview/bug/CSCvp51493
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