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Vulnerability of Cisco Web Security Appliance: denial of service via HTTPS Certificate

Synthesis of the vulnerability 

An attacker can trigger a fatal error via HTTPS Certificate of Cisco Web Security Appliance, in order to trigger a denial of service.
Impacted systems: AsyncOS, Cisco WSA.
Severity of this alert: 3/4.
Creation date: 04/07/2019.
Références of this alert: CERTFR-2019-AVI-304, cisco-sa-20190703-wsa-dos, CSCvo33747, CVE-2019-1886, VIGILANCE-VUL-29693.

Description of the vulnerability 

An attacker can trigger a fatal error via HTTPS Certificate of Cisco Web Security Appliance, in order to trigger a denial of service.
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This cybersecurity bulletin impacts software or systems such as AsyncOS, Cisco WSA.

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

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

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

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvo33747.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo33747
  https://tools.cisco.com/bugsearch/bug/CSCvo33747
  https://tools.cisco.com/quickview/bug/CSCvo33747
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