PT-2019-3282 · Cisco · Cisco Nx-Os+1

Published 2019-08-28 · Updated 2020-10-16 · CVE-2019-1967

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco NX-OS Software (affected versions not specified)

Description A vulnerability in the Network Time Protocol (NTP) feature could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The issue is due to excessive use of system resources when the device is logging a drop action for received MODE PRIVATE (Mode 7) NTP packets. An attacker could exploit this by flooding the device with a steady stream of Mode 7 NTP packets, potentially causing high CPU and memory usage, which could lead to internal system processes restarting or the device unexpectedly reloading. The NTP feature is enabled by default.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-399

Related Identifiers

BDU:2019-03305

CVE-2019-1967

Affected Products

Cisco Nx-Os

Cisco Nexus

References · 4

• https://bdu.fstec.ru/vul/2019-03305 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-1967 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-ntp-dos · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-1967 · Vendor Advisory