Input validation error in Cisco AsyncOS for Web Security Appliances - CVE-2019-1886
Published: July 8, 2019
Vulnerability identifier: #VU19021
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2019-1886
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco AsyncOS for Web Security Appliances
Cisco AsyncOS for Web Security Appliances
Detailed vulnerability description
The vulnerability allows an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability exist due to insufficient validation of Secure Sockets Layer (SSL) server certificates in the HTTPS decryption feature. A remote attacker can install a malformed certificate in a web server, send a request to it through the Cisco WSA and cause an unexpected restart of the proxy process on an affected device.
How to mitigate CVE-2019-1886
Install update from vendor's website.