CVE-2017-12231
Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability
Cisco · IOS software
Vulnerability details
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS could allow an unauthenticated, remote attacker to cause a denial of service.
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