Cisco IOS Software NAT denial of service (cisco-sa-20170927-nat)

High Nessus Plugin ID 103669


The remote device is missing a vendor-supplied security patch.


According to its self-reported version and configuration, the Cisco IOS software running on the remote device is affected by a denial of service vulnerability in the Network Address Translation (NAT) feature. An unauthenticated, remote attacker can exploit this, via specially crafted NAT requests, to cause the switch to stop processing traffic, requiring a device restart to regain functionality.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvc57217

See Also

Plugin Details

Severity: High

ID: 103669

File Name: cisco-sa-20170927-nat.nasl

Version: 1.3

Type: combined

Family: CISCO

Published: 2017/10/05

Modified: 2018/02/02

Dependencies: 47864

Risk Information

Risk Factor: High


Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C


Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Patch Publication Date: 2017/09/27

Vulnerability Publication Date: 2017/09/27

Reference Information

CVE: CVE-2017-12231

BID: 101039

OSVDB: 166255


CISCO-SA: cisco-sa-20170927-nat

IAVA: 2017-A-0286