CVE-2017-12340

CVE-2017-12340 is a medium-severity vulnerability in Cisco NX-OS System Software affecting Cisco MDS Multilayer Director Switches and Nexus 7000/7700 Series Switches. It allows an authenticated, local attacker with administrative or Python execution privileges to bypass the Python scripting sandbox and access the Bash shell, even if disabled. The attack requires local access and authentication, and its impact is limited to low confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.