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Vulnerability of Cisco Web Security Appliance: denial of service via Malformed HTTP/S Request

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Malformed HTTP/S Request 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: 02/05/2019.
Références of this alert: CERTFR-2019-AVI-193, cisco-sa-20190501-wsa-dos, CSCvn31450, CVE-2019-1817, VIGILANCE-VUL-29189.

Description of the vulnerability 

An attacker can trigger a fatal error via Malformed HTTP/S Request of Cisco Web Security Appliance, in order to trigger a denial of service.
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This vulnerability note impacts software or systems such as AsyncOS, Cisco WSA.

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

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

An attacker with a expert ability can exploit this computer threat note.

Solutions for this threat 

Cisco Web Security Appliance: solution CSCvn31450.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn31450
  https://tools.cisco.com/bugsearch/bug/CSCvn31450
  https://tools.cisco.com/quickview/bug/CSCvn31450
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