Improper Certificate Validation in Cisco AsyncOS for Web Security Appliances and Cisco AsyncOS for Cisco Email Security Appliance - CVE-2021-1566

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Main Vulnerability Database Vulnerabilities #VU54172

Improper Certificate Validation in Cisco AsyncOS for Web Security Appliances and Cisco AsyncOS for Cisco Email Security Appliance - CVE-2021-1566

Published: June 16, 2021


Vulnerability identifier: #VU54172
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-1566
CWE-ID: CWE-295
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco AsyncOS for Web Security Appliances
Cisco AsyncOS for Cisco Email Security Appliance

Detailed vulnerability description

The vulnerability allows a remote attacker to preform MitM attack.

The vulnerability exists due to improper certificate validation when establishing TLS connection. A remote attacker can perform a man-in-the-middle (MitM) attack.


How to mitigate CVE-2021-1566

Install updates from vendor's website.

Sources