high
8.6
CWE
400 399
CVE Published
Advisory Published
Updated

CVE-2019-1967: Cisco NX-OS Software Network Time Protocol Denial of Service Vulnerability

First published: Thu Aug 29 2019(Updated: )

A vulnerability in the Network Time Protocol (NTP) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to excessive use of system resources when the affected device is logging a drop action for received MODE_PRIVATE (Mode 7) NTP packets. An attacker could exploit this vulnerability by flooding the device with a steady stream of Mode 7 NTP packets. A successful exploit could allow the attacker to cause high CPU and memory usage on the affected device, which could cause internal system processes to restart or cause the affected device to unexpectedly reload. Note: The NTP feature is enabled by default.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Nx-os=6.2
Cisco Nx-os=7.3
Cisco Nx-os=8.1
Cisco Nx-os=8.2
Cisco Nx-os=8.3
Cisco MDS 9000
Cisco Mds 9100
Cisco Mds 9140
Cisco Mds 9200
Cisco Mds 9500
Cisco Mds 9700
Cisco Nx-os=6.0\(2\)a8\(9.7\)
Cisco Nx-os=6.0\(2\)u6
Cisco Nx-os=7.0\(3\)i
Cisco Nx-os=9.2
Cisco Nx-os=9.2\(1\)
Cisco Nexus 3016
Cisco Nexus 3048
Cisco Nexus 3064
Cisco Nexus 3064-t
Cisco Nexus 31108pc-v
Cisco Nexus 31108tc-v
Cisco Nexus 31128pq
Cisco Nexus 3132c-z
Cisco Nexus 3132q
Cisco Nexus 3132q-v
Cisco Nexus 3132q-xl
Cisco Nexus 3164q
Cisco Nexus 3172
Cisco Nexus 3172pq-xl
Cisco Nexus 3172tq
Cisco Nexus 3172tq-32t
Cisco Nexus 3172tq-xl
Cisco Nexus 3232c
Cisco Nexus 3264c-e
Cisco Nexus 3264q
Cisco Nexus 3408-s
Cisco Nexus 34180yc
Cisco Nexus 3432d-s
Cisco Nexus 3464c
Cisco Nexus 9000v
Cisco Nexus 92160yc-x
Cisco Nexus 92300yc
Cisco Nexus 92304qc
Cisco Nexus 92348gc-x
Cisco Nexus 9236c
Cisco Nexus 9272q
Cisco Nexus 93108tc-ex
Cisco Nexus 93108tc-fx
Cisco Nexus 93120tx
Cisco Nexus 93128tx
Cisco Nexus 93180lc-ex
Cisco Nexus 93180yc-ex
Cisco Nexus 93180yc-fx
Cisco Nexus 93216tc-fx2
Cisco Nexus 93240yc-fx2
Cisco Nexus 9332c
Cisco Nexus 9332pq
Cisco Nexus 93360yc-fx2
Cisco Nexus 9336c-fx2
Cisco Nexus 9336pq Aci Spine
Cisco Nexus 9348gc-fxp
Cisco Nexus 9364c
Cisco Nexus 9372px
Cisco Nexus 9372px-e
Cisco Nexus 9372tx
Cisco Nexus 9372tx-e
Cisco Nexus 9396px
Cisco Nexus 9396tx
Cisco Nx-os=6.0\(2\)a8
Cisco Nx-os=7.0\(3\)i7
Cisco Nexus 3524
Cisco Nexus 3524-x
Cisco Nexus 3524-xl
Cisco Nexus 3548
Cisco Nexus 3548-x
Cisco Nexus 3548-xl
Cisco Nx-os=7.0\(3\)f
Cisco Nexus 36180yc-r
Cisco Nexus 3636c-r
Cisco Nexus 9504
Cisco Nexus 9508
Cisco Nexus 9516
Cisco Nx-os=7.1\(4\)
Cisco Nx-os=7.1\(4\)n1\(1\)
Cisco Nx-os=7.1\(5\)
Cisco Nx-os=7.2
Cisco Nexus 5548p
Cisco Nexus 5548up
Cisco Nexus 5596t
Cisco Nexus 5596up
Cisco Nexus 56128p
Cisco Nexus 5624q
Cisco Nexus 5648q
Cisco Nexus 5672up
Cisco Nexus 5696q
Cisco Nexus 6001
Cisco Nexus 6004
Cisco Nx-os=7.3\(2\)d1\(1\)
Cisco Nx-os=8.0
Cisco Nx-os=8.3\(2\)s5
Cisco Nexus 7000
Cisco Nexus 7000 10-slot
Cisco Nexus 7000 18-slot
Cisco Nexus 7000 4-slot
Cisco Nexus 7000 9-slot
Cisco Nexus 7700
Cisco Nexus 7700 10-slot
Cisco Nexus 7700 18-slot
Cisco Nexus 7700 2-slot
Cisco Nexus 7700 6-slot

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