Auth bypass in Cisco iOS

CVE-2015-0607

The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016.

Vulnerability class: Broken Authentication

EPSS: 0.020 (78.3th percentile) — read the EPSS interpretation.