Cisco NX-OS Precision Time Protocol (PTP) Denial of Service Vulnerability

high Nessus Plugin ID 128877


The remote Cisco device is affected by a denial of service vulnerability


According to its self-reported version, the Cisco NX-OS Software is affected by a denial of service (DoS) vulnerability which exists in its Precision Time Protocol (PTP) implementation due to a lack of protection against PTP frame flood attacks. An unauthenticated, remote attacker can exploit this issue, by sending large streams of malicious PTP traffic to the device, to cause the system to stop responding.

Please see the included Cisco BIDs and the Cisco Security Advisory for more information.


Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCvg21830.

See Also

Plugin Details

Severity: High

ID: 128877

File Name: cisco-sa-20181017-nexus-ptp-dos.nasl

Version: 1.9

Type: combined

Family: CISCO

Published: 9/17/2019

Updated: 4/27/2021

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS Score Source: CVE-2018-0378


Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:nx-os

Required KB Items: Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device

Exploit Ease: No known exploits are available

Patch Publication Date: 12/19/2018

Vulnerability Publication Date: 10/17/2018

Reference Information

CVE: CVE-2018-0378

BID: 105669