#VU116080 Improper authentication in Cisco IOS XE - CVE-2025-20160
Published: September 24, 2025
Vulnerability identifier: #VU116080
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20160
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco IOS XE
Cisco IOS XE
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in the implementation of the TACACS+ protocol where the system does not properly check whether the required TACACS+ shared secret was configured. A remote machine-in-the-middle attacker can read unencrypted TACACS+ messages or impersonate the TACACS+ server and falsely accept arbitrary authentication requests, leading to information disclosure.
Remediation
Install updates from vendor's website.