CVE-2017-12240
Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability
Cisco · IOS and IOS XE Software
Vulnerability details
The Dynamic Host Configuration Protocol (DHCP) relay subsystem of Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system.
Added to CISA KEV: 2022-03-03
Ransomware campaign use: Unknown
CISA due date: 2022-03-24
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC