Cisco IOS XE for Cisco ASR 920 Series Routers Zero Touch Provisioning DoS (cisco-sa-20170322-ztp)

high Nessus Plugin ID 99033


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


According to its self-reported version, the Cisco IOS XE software running on the remote Cisco ASR 920 Series device is affected by a denial of service vulnerability due to a format string flaw when processing DHCP packets for Zero Touch Provisioning. An unauthenticated, remote attacker can exploit this issue, via a specially crafted DHCP packet, to cause the device to reload.

Note that for this vulnerability to be exploited, the device must be configured to listen on the DHCP server port. By default, the device does not listen on this port.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCuy56385

See Also

Plugin Details

Severity: High

ID: 99033

File Name: cisco-sa-20170322-ztp.nasl

Version: 1.8

Type: local

Family: CISCO

Published: 3/29/2017

Updated: 11/13/2019

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Host/Cisco/IOS-XE/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 3/22/2017

Vulnerability Publication Date: 3/22/2017

Reference Information

CVE: CVE-2017-3859

BID: 97008


CISCO-SA: cisco-sa-20170322-ztp